Typo and partial fixes to Issue 426

[dilawar]

• Fixes typo setting stoich.path to stoich.ReacSystemPath for cross compartment model gives seg fault #426
• getFieldNames also available on the moose element. For example:

>>> a = moose.Stoich('a')
>>> moose.getFieldNames(a)    # available before
>>> a.getFieldNames()               # added in this PR

[hrani]

latest git commit 954f6ea

moose.loadModel('~/moose-examples/genesis/EGFR_MAPK_58.g','/k',"gsl")
Solver is added to model path /k with gsl solver

st = moose.element('/k/kinetics/stoich')
st.getFieldNames()
KeyError Traceback (most recent call last)
in
----> 1 st.getFieldNames()
KeyError: "getFieldNames is not found on '/k[0]/kinetics[0]/stoich[0]'."

---

moose.getFieldNames(st)
TypeError Traceback (most recent call last)
in
----> 1 moose.getFieldNames(st)

~/MOOSE/moose-core/python/moose/init.py in getFieldNames(classname, fieldtype)
322 Names of the fields of type finfoType in class className.
323 """
--> 324 return _moose.getFieldNames(classname, fieldtype)
TypeError: getFieldNames(): incompatible function arguments. The following argument types are supported:
1. (arg0: str, arg1: str) -> List[str]

Invoked with: <moose.Stoich id=639 dataIndex=0 path=/k[0]/kinetics[0]/stoich[0]>, '*'

moose.getFieldNames(st,'value')

---

TypeError Traceback (most recent call last)
in
----> 1 moose.getFieldNames(st,'value')

~/MOOSE/moose-core/python/moose/init.py in getFieldNames(classname, fieldtype)
322 Names of the fields of type finfoType in class className.
323 """
--> 324 return _moose.getFieldNames(classname, fieldtype)
325
326

TypeError: getFieldNames(): incompatible function arguments. The following argument types are supported:
1. (arg0: str, arg1: str) -> List[str]

Invoked with: <moose.Stoich id=639 dataIndex=0 path=/k[0]/kinetics[0]/stoich[0]>, 'value'

However with this present PR, getFieldNames are working