Insert the hooks
Add hooks into installation workflow and adapt hooks accordingly
Clean up
Raise missing search path at first hook run
Update makefiles
Updates from code review:
- create /var/lib/YaST2/hooks in spec file
- verify! the hook search path exists in the hook constructor
- add test case for search path verify
Add Makefiles for hooks
Makefile, spec updates; other minor fixes
Update spec, changes, version