pgsql: Add cvs tags to msvc build files, along with a (very short)

Log Message:
-----------
Add cvs tags to msvc build files, along with a (very short) comment about
what each script does.

Modified Files:
--------------
pgsql/src/tools/msvc:
Install.pm (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/Install.pm.diff?r1=1.1&r2=1.2)
Mkvcbuild.pm (r1.1 -> r1.2)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/Mkvcbuild.pm.diff?r1=1.1&r2=1.2)
Project.pm (r1.9 -> r1.10)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/Project.pm.diff?r1=1.9&r2=1.10)
Solution.pm (r1.16 -> r1.17)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/Solution.pm.diff?r1=1.16&r2=1.17)
build.bat (r1.6 -> r1.7)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/build.bat.diff?r1=1.6&r2=1.7)
builddoc.bat (r1.4 -> r1.5)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/builddoc.bat.diff?r1=1.4&r2=1.5)
clean.bat (r1.2 -> r1.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/clean.bat.diff?r1=1.2&r2=1.3)
gendef.pl (r1.4 -> r1.5)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/gendef.pl.diff?r1=1.4&r2=1.5)
install.pl (r1.6 -> r1.7)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/install.pl.diff?r1=1.6&r2=1.7)
mkvcbuild.pl (r1.17 -> r1.18)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/mkvcbuild.pl.diff?r1=1.17&r2=1.18)
pgbison.bat (r1.4 -> r1.5)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/pgbison.bat.diff?r1=1.4&r2=1.5)
pgflex.bat (r1.3 -> r1.4)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/pgflex.bat.diff?r1=1.3&r2=1.4)
vcregress.bat (r1.2 -> r1.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/tools/msvc/vcregress.bat.diff?r1=1.2&r2=1.3)