New convertion system from timeJ to timeS
Using try/except to handle old python without .total_seconds()
timeS from timeJ used bad_flag for fill_value.
Bugfix, it was missing to remove t0 from the estimated TimeS
timeQ to timeS using pycurrents' (Eric) concept.
Merge branch 'timeQ'

Improved the timeJ to timeS, and included a timeQ to timeS.