first phase filter
try to do phase filtering with gtmktime
do piece-wise gtmktime calls for large number of periods
convert from periodic time selection to arbitrary tiem selection from file
clean up time_select, reuse FirstCut()
allow time selections in MET, MJD, or JD
clean up
avoid name clash!
Merge pull request #41 from zblz/time-selection-from-file

Time selection from file