Wrote a python routine called get_value_by_ref_name that takes
a variable name string as an argument. The string is passed to
ref_attributes to find the address and returns a REF2 structure. The REF2
structure is passed to ref_to_value and the type and value of the variable
is returned in a structure. We call vval_<type> to extract the raw value
from the structure and return that to python space.
Made a couple of other bug fixes in the FieldVisior and cpp input file
example found while investigating this issue.
refs #123
57c76041f5