Resolve "Disable unquoted string literals"
Closes #495 (closed)
Closes #654 (closed)
The only problem I encountered is that the name of the method GAMMA for the multi-bunch binning in Opal-Cycl caused a name-clash: I can't define a string constant GAMMA because it's used to compute the energy. I renamed both methods to GAMMA_BINNING and BUNCH_BINNING respectively.