Fixed CExpRKMethod bugs
	modified:   CExpRKMethod.cpp
	modified:   CExpRKMethod.h
	modified:   CHybridMethodODE45.cpp
	modified:   CHybridMethodODE45.h
- add an option to not stop simulation, when two assignments would occur at the same time (disabled by default)
Disabled COPASI_NONLIN_DYN_OSCILLATION by default.