Update Mac installer Welcome and ReadMe files for 3.7.0a1

Mac/BuildScript/resources/ReadMe.rtf

@@ -1,4 +1,4 @@
-{\rtf1\ansi\ansicpg1252\cocoartf1504\cocoasubrtf750
+{\rtf1\ansi\ansicpg1252\cocoartf1504\cocoasubrtf830
 {\fonttbl\f0\fswiss\fcharset0 Helvetica;\f1\fmodern\fcharset0 CourierNewPSMT;}
 {\colortbl;\red255\green255\blue255;}
 {\*\expandedcolortbl;;}
@@ -7,38 +7,25 @@
 
 \f0\fs24 \cf0 This package will install Python $FULL_VERSION for Mac OS X $MACOSX_DEPLOYMENT_TARGET for the following architecture(s): $ARCHITECTURES.\
 \
+\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\partightenfactor0
+
+\b \cf0 NOTE:
+\b0   This is an early developer preview of the next feature release of Python 3.  Many features are yet to be added and existing features may change substantially or be deleted prior to the feature code freeze.\
+\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\pardirnatural\partightenfactor0
+\cf0 \
 \pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\pardirnatural\partightenfactor0
 
-\b \cf0 \ul \ulc0 Which installer variant should I use?
+\b \cf0 \ul \ulc0 Certificate verification and OpenSSL\
+
 \b0 \ulnone \
-\
-\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\pardirnatural\partightenfactor0
-
-\b \cf0 **NEW**
-\b0  For Python 3.6, the python.org website now provides only one installer variant for download: one that installs a 
-\i 64-bit/32-bit Intel
-\i0  Python capable of running on 
-\i Mac OS X 10.6 (Snow Leopard)
-\i0  or later.  This ReadMe was installed with the 
-\i $MACOSX_DEPLOYMENT_TARGET
-\i0  variant.  By default, Python will automatically run in 64-bit mode if your system supports it.  The Python installed by this installer is built with private copies of some third-party libraries not included with or newer than those in OS X itself.  The list of these libraries is included at the end of the License.rtf file.
-\b \ul \
-\
-Certificate verification and OpenSSL\
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-
-\b0 \cf0 \ulnone \
-\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\pardirnatural\partightenfactor0
-
-\b \cf0 **NEW**
-\b0  This variant of Python 3.6 now includes its own private copy of OpenSSL 1.0.2.  Unlike previous releases, the deprecated Apple-supplied OpenSSL libraries are no longer used.  This also means that the trust certificates in system and user keychains managed by the 
+This variant of Python 3.7 includes its own private copy of OpenSSL 1.0.2.  The deprecated Apple-supplied OpenSSL libraries are no longer used.  This means that the trust certificates in system and user keychains managed by the 
 \i Keychain Access 
 \i0 application and the 
 \i security
 \i0  command line utility are no longer used as defaults by the Python 
 \f1 ssl
-\f0  module.  For 3.6.0, a sample command script is included in 
-\f1 /Applications/Python 3.6
+\f0  module.  For this preview release, a sample command script is included in 
+\f1 /Applications/Python 3.7
 \f0  to install a curated bundle of default root certificates from the third-party 
 \f1 certifi
 \f0  package ({\field{\*\fldinst{HYPERLINK "https://pypi.python.org/pypi/certifi"}}{\fldrslt https://pypi.python.org/pypi/certifi}}).  If you choose to use 
@@ -47,18 +34,17 @@ Certificate verification and OpenSSL\
 \
 The bundled 
 \f1 pip
-\f0  included with the Python 3.6 installer has its own default certificate store for verifying download connections.\
+\f0  included with this installer has its own default certificate store for verifying download connections.\
 \
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-\b \cf0 \ul Update your version of Tcl/Tk to use IDLE or other Tk applications
+\b \ul Update your version of Tcl/Tk to use IDLE or other Tk applications
 \b0 \ulnone \
 \
 To use IDLE or other programs that use the Tkinter graphical user interface toolkit, you need to install a newer third-party version of the 
 \i Tcl/Tk
 \i0  frameworks.  Visit {\field{\*\fldinst{HYPERLINK "https://www.python.org/download/mac/tcltk/"}}{\fldrslt https://www.python.org/download/mac/tcltk/}} for current information about supported and recommended versions of 
 \i Tcl/Tk
-\i0  for this version of Python and of Mac OS X.  For the initial release of Python 3.6, the installer is still linked with Tcl/Tk 8.5.\
+\i0  for this version of Python and of Mac OS X.  For this developer preview, the installer is still linked with Tcl/Tk 8.5.\
 
 \b \ul \
 Other changes\

Mac/BuildScript/resources/Welcome.rtf

@@ -1,7 +1,7 @@
-{\rtf1\ansi\ansicpg1252\cocoartf1504
+{\rtf1\ansi\ansicpg1252\cocoartf1504\cocoasubrtf830
 \cocoascreenfonts1{\fonttbl\f0\fswiss\fcharset0 Helvetica;}
 {\colortbl;\red255\green255\blue255;}
-{\*\expandedcolortbl;\csgray\c100000;}
+{\*\expandedcolortbl;;}
 \paperw11905\paperh16837\margl1440\margr1440\vieww12200\viewh10880\viewkind0
 \pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\partightenfactor0
 
@@ -17,14 +17,12 @@
 \b IDLE
 \b0 .\
 \
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-\b \cf0 NEW:
-\b0   There are important changes in this release regarding network security and trust certificates.  Please see the ReadMe for more details.\
+\b NOTE:
+\b0   This is an early developer preview of the next feature release of Python 3.  Many features are yet to be added and existing features may change substantially or be deleted prior to the feature code freeze.\
 \
-\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\partightenfactor0
 
-\b \cf0 IMPORTANT:
+\b IMPORTANT:
 \b0  
 \b IDLE
 \b0  and other programs using the