adds default conditioning if no preconditioner exists
updated conditioner/solver api to allow for graph setting/getting, added a public Condition function to the greedy solver with an appropriate call warning, updated the greedy preconditioner to ignore commodity weights if they don't exist, and added a condition test
adds and documents possible environment variables to set for the rng path and data path
fpath tweak
data->nuc_data
cleaned up the file finding and calling thereof to be more straightforward and use correct terminology
indentation
assert hotfix
* fixed hdf5 problem - variable string for blob was being deallocated because hdf5 only stores ptr until flush
fixed hdf5 back doc comments
paths to files
some silly string concats
added h5fflush
Merge branch 'hdf5-fix' of https://github.com/rwcarlsen/cyclus into rwcarlsen-hdf5-fix
Merge branch 'default-cond' of https://github.com/gidden/cyclus into gidden-default-cond