Make source package as 3.0 (native)

As native package, patches and watch files are useless (and were not
previously used anyway).
Use debhelper sequencer instead on cdbs
Removed generated files
Do not install or build static libraries
Fix dependency of muffin and libmuffin0 wrt muffin-common
Add muffin-dbg package
Allow parallel build
Merge pull request #44 from nbourdau/sanetize-debpkg

Sanitize debpkg