Addition of a new sub-package within `/kernel/`

1. create a new directory (e.g. /kernel/somepackage) in /kernel/ for your sub-package (somepackage)
2. place all the necessary sources and headers there (/kernel/somepackage)
3. git add all new sources and headers
4. copy /kernel/sample/Makefile.am and adapt it:
   • replace sample with your sub-package name (e.g. _libsample_ with _libsomepackage_)
   • update libsomepackage_la_SOURCES list
   • update libsomepackage_la_include_HEADERS and libsomepackage_la_includedir
   • git add this new Makefile.am
5. change /configure.ac and /kernel/Makefile.am similar to SAMPLE (NOTE: use your sub-package name somepackage instead of sample)
6. commit all the changes and test it on TC, e.g. as indicated by our Development Model