mk_release_tarball.bash: simplictic script to make releases

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
release v0.3.5

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
mk_release_tarball.bash: force removal (read-only files need user's approval otherwise)

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>