Use consistent version annotations instead of something ad hoc.

Doc/lib/libcfgparser.tex

@@ -128,7 +128,8 @@ Returns a list of options available in the specified \var{section}.
 
 \begin{methoddesc}{has_option}{section, option}
 If the given section exists, and contains the given option. return 1;
-otherwise return 0. (New in 1.6)
+otherwise return 0.
+\versionadded{1.6}
 \end{methoddesc}
 
 \begin{methoddesc}{read}{filenames}
@@ -169,20 +170,22 @@ for the option are \samp{0} and \samp{1}, any others will raise
 
 \begin{methoddesc}{set}{section, option, value}
 If the given section exists, set the given option to the specified value;
-otherwise raise \exception{NoSectionError}. (New in 1.6)
+otherwise raise \exception{NoSectionError}.
+\versionadded{1.6}
 \end{methoddesc}
 
 \begin{methoddesc}{write}{fileobject}
 Write a representation of the configuration to the specified file
 object.  This representation can be parsed by a future \method{read()}
-call. (New in 1.6)
+call.
+\versionadded{1.6}
 \end{methoddesc}
 
 \begin{methoddesc}{remove_option}{section, option}
 Remove the specified \var{option} from the specified \var{section}.
 If the section does not exist, raise \exception{NoSectionError}. 
 If the option existed to be removed, return 1; otherwise return 0.
-(New in 1.6)
+\versionadded{1.6}
 \end{methoddesc}
 
 \begin{methoddesc}{remove_section}{section}