Update release version number.
Remove .bzrignore.
Add export filters.
Add .gitattributes to export filter.
Use git archive to make the release package.
Remove references to kunquat-player and example composition in INSTALL.
Disable checking of libarchive.
Remove libarchive-dev from suggested install prerequisites in INSTALL.
Merge pull request #138 from kagu/releasepkg

release.sh
Update development years in COPYING.
Remove obsolete references to removed libkunquat API functions.
Merge pull request #141 from kagu/fix_docs061

Fix documentation