Adaptation of the GDE prototype code to work with quadtiles instead of 10-arcsec cells

See merge request !18

Created alternative function to retrieve GHS built-up area from OBM
Tiles database in GDE_TOOLS_psql.py (connection to the database opened
before calling the function). Updated config file template and reader
accordingly.

Modified scripts further down the processing line to work well with the new definition of industrial cells

See merge request !17

Completed module and tools that create industrial cells around input points

See merge request !16

Checks added to GDE_TOOLS_read_config_file.py