Updates to Makefile due to SVN to Git repository conversion.

Remove both .ignore and .gitignore files from to-be-installed directories.

Remove/exclude .git directory (rather than .svn directories) for packaging.
Updates to Debian packaging rules due to SVN to Git repository conversion.

Remove/exclude .git directory (rather than .svn directories) for packaging.
The 'sync-ignore' script is unnecessary for Git repositories.