Squashed 'moose-core/' changes from 7c9fe23..1b5b9a9

1b5b9a9 cspace and genesis model can be merged, yet to check what will happen with co-ordinates
9a405f6 for merging model one can pass file path or the modelpath
51da21a auto-coodinates are not done here, writter(SBML or kkit) will take care
4ba03b7 spell mistake
355e3e6 missing msg definition
3969bcb removed SBML option in Makefile
d1c4119 Merging 2 genesis model
1469b6e clean up in writting plot when file was read from SBML
4894a96 changes made to co-ordinate calculation depending where it comes from (GUI/direct), and type of file (GENESIS,SBML,cspace)
c11fcf0 validation.py is added: common place to validate SBML model before reading and writing, various changes made wrt chemUtil
6e7fa32 changes made to add chemUtil as a package and moose.py spell mistake
4551455 removing pyc files
e6f8c8f chemical based utils like add_delete_ChemicalSolver, chemiConnectionUtil: where chemical objects and connection are searched, graphUtils: used just pygraphviz to la...