GAM fusion raster prediction, further modificationfor Venzuela tmax interp

GAM fusion function first change to adapt code for any region

GAM Fusion, Venzuela tmax interp, modification to make code more general

Data preparation Venezuela, added monthly query from Postgres station database

Venezuela preparation of data for tmax prediction

LST climatology, added tile loop, downloading and calculation of climatology for 6 tiles in Venezuela

LST climatology, added loop to produce monhtly mean and write out tif from GRASS database

LST climatology, added function to create list of files per month and other modifications

LST climatolgoy, modified download function and added section for downloading of tiles

LST climatology, initial commit script from Jim Regetz commit 01b3830e, task#375 and task#316