Reaction Copy button implemented (without Compartment option)
Enhanced applyRowPivot methods and removed the reduced stoichiometry matrix.
Make new and copied function naming consistent with rest of COPASI.
Compartment Copy button implemented (without options to include species and reactions).
add a method to determine if an object is referred to elsewhere in the model
some updates to the model merging widget
allow mergi of global quantities and reactions
small improvements in merging widget