shell:ps: SCHEDSTATISTICS cols only if needed
Merge pull request #1122 from Kijewski/ps-SCHEDSTATISTICS

shell:ps: SCHEDSTATISTICS cols only if needed
typo fix
removed unreachable code
msba2: add pseudoterm license
Merge pull request #1134 from kaspar030/pseudoterm_license

msba2: add pseudoterm license
Merge pull request #1132 from jan-schreib/master

Removed unreachable code and fixed a typo.
ringbuffer: remove example
ringbuffer: add convenience functions

This patch add `peek` functionality, and empty and full helpers.
ringbuffer: fix parameter types

It is a bad idea to use signed types for lengths.
Mark pointers a `restrict`, since the ringbuffer is not thread safe
anyway.
ringbuffer: remove pointer to the end

There is no need for an explicit pointer to the end of the buffer.
ringbuffer: don't overwrite in `ringbuffer_add`
ringbuffer: add documentation
ringbuffer: add static initializer
ringbuffer: add test for add_one and get_one
Write unittests for ringbuffer
Add 'test_ringbuffer_get_too_much'