Spherical lib updated. Now field-based coloring is supported.
Minor fix in SQL script.
Instrument column added to HTM index.
Instrument added to observations. Filtering in search implemented.
Minor changes.
Regions are colored by instrument.
Added script to compute parallel footprints.
Search class now uses instrument and obsID as composite key.
Observation list and WS updated to use composite key as well.
Instrument enum values sorted out.