Re-enable fix_segfault_with_small_ref.patch after refreshing it.
Temporary patch to build dynamically samtools.

I hope it can be removed at the next upstream release.
Allow parallel building.
Clean before installing test files (this removes compiled files).
Recommend python since samtools installs a python script in /usr/bin.
One more small patch that I hope removing at the next upstream release.
Current changelog.