frame class: getter for coordinate systems added
coordinate system class has now an internal list with all coordinate systems
coordinate system class is now printable
static list with all existing frames added to frame class
handling of C++ compiler flags improved in main cmake file
utils folder removed
unit tests for coordinate system class completed
unit test for frame class started
text user interface prepared for using as logging output
Merge branch 'develop' into sequencer

Conflicts:
	CMakeLists.txt