GitLab

renaming Collimator to CCollimator where C stands for cyclotron; all other collimators are implemented using FlexibleCollimator; This also fixes #224

first version of multi-slit/pepperpot/what ever aka flexible collimator. However way to slow to be practical

This reverts commit 69985bb1.

- remove 'using namespace' from header files
- remove 'using std::string' and 'using std::abs' from header files

For reason see:
o http://stackoverflow.com/questions/5849457/using-namespace-in-c-headers