initial orbitalLC.py and phase selection

move phase selection to gtmktime
add bin files for orblc
add phase info to results filename for OrbitalLC
try to do phase filtering with gtmktime
do piece-wise gtmktime calls for large number of periods
fix _dump_filename
add phase info to Result dictionary
cosmetic fixes to filenames, ascii result file
small fixes for OrbLC plot
allow phase selections through zero phase