update schema: one measurements table for both RT and DM data
update data harvest to write both RT and DM data to single measurement table
fix update script to use new combined measurements table
use context.include and index all surface properties files (not just real-time)
update views: remove unneeded columns from data views and remove DISTINCT from map view queries
move all job parameters into context groups as requested by Julian
replace DISTINCT in map views
add missing comma in SQL for dm_data table