Updated real time Slocum file option configuration function (added support for freewave surface logs).
Updated NetCDF L0 output configuration function (added GPS status).
Fixed bad data inconsitency check bug in dba concatenating function.
Recoded option handling in Slocum data loading functions for consistency, and adapted main scripts to new code.

  * Switch time filtering period input units in load Slocum data
    from serial date numbers to POSIX time.
Renamed struct string format function strfglider to strfstruct, and adapted related code.
Removed some requirements for deployment structure thanks to generalization of glider string formatting function.
Cosmetic changes in documentation comments of several functions missing syntax section.