In preparation for release build the Windows installer source is moved
out of ground/gcs source tree into release directory. It is also disabled
in the qmake source file and removed from top level Makefile.
Since msysGit lacks the install command, simple cp -f replacement
is provided. Don't forget to copy it into the msysGit bin subdirectory.
Introduced CLEAN_BUILD=NO make option to test packaging w/o cleaning.
Recommended for test builds only, not for production run.
make -j works great after PyMite dependency fix by commit
0005729056e0980a859a990455f4823960851449
So comment is updated as well.
