parseargs easier to duplicate.

Merge branch 'update' of https://github.com/hasimpson-usgs/geomag-algorithms into hasimpson-usgs-update

Add NEW and BDT to Edge metadata.

Use starttime/endtime from the options parameter instead of being passed in as a seperate parameter.

Moved parameters out of init,  and into run/run_as_update.  Passed all arguments as options into run/run_as_update.  Got smarter on how we select the ouput parameters.

Broke out input-edge/output-edge arguments into seperate arguments with the standard defaults, so the user doesn't have to enter them all the time. Set starttime/endtime type to UTCDateTime.  Passed args into run/run_as_update

Readme revamp

Abandoned realtime update method over all new data, replaced with recursive method for a single timespan at a time, oldest to newest.

Refactored starttime/endtime to default to None, so algorithm and outputFactory can use starttime/endtime from input source.

Added update_realitime flag to init.  run_as_update is completed up to finding gaps, and backing up to find 'All' new data.  Still need to call the algorithm,  and write out the data that's 'new'

Added routines to return the number of seconds in a given interval, and to detect if 'new' data exists between two data sets

moved create_gap_stream from controller.py to TimeseriesFactory.py, made some sense,  and it gave me access to starttime and endtime