Fix model test reading of texture animation part of PIE files. Did not account for
possibility of floating point values, that are allowed.
Slight cleanup
Run astyle over atmos.cpp and fix some style manually.
Cleanup of PIE stats loading.
Implement lazy loading of PIE files. There is no longer any need to add them in WRF files
before referencing them from stats or other files.
Make some string literals compatible with more strict c++11 requirements.