- new file dialogs on Vista+
- tclWinTime.c was cleaned up a bit, and no
longer uses 'timezone' (which is now _timezone
in VS2015, so we get to avoid patching that
file).
- rules.vc is patched in both Tcl and Tk sources
to allow building with VS2015
The user-facing scripts in PCbuild have been updated to be easier to use
and the buildbot scripts in Tools\buildbot have been updated to use the
user-facing scripts in PCbuild wherever possible.