Merging with bp/interp to use some of Benoit's code for precip interpolation

Merge branch 'bp/interp' into aw/precip

OR data preparation, initial commit for extraction of covariates from raster stack

OR data preparation task#363, modified code for ghcn to create a shapefile

GHNCD station data selection using Postgres database, initial commit, task #363

GAM LST, added specific and general diagnostic measures (e.g.MAE) GAM+Kriging, task #364 and #406

GAM LST, adding lines to summarize samling RMSE using plots, task #409

GAM LST, first code to test effect of sampling on GAM, task #409

GAM LST, added model and modified summary plots, run on 365 dates GAM+Kriging, task #364 and #406

GAM LST, modify code to generalize number of models and assessment,GAM+Kriging task #364

GAM LST, major modifications to create GAM+Kriging code, task #364

GAM LST, adding lines to assess RMSE per month over 365 dates, task #406

GAM LST, added model with forest only term -364 dates assessment, task #406

GAM LST, added section to save training and test residuals in shapefiles, task #361

GAM LST, changed triple nesting lat,long,Elev to double, 365 dates run, task #406 and #361

GAM LST, used monthly LST average instead of daily, task #361

GAM LST, adding new model with grass land cover, task #361

GAM using LST as input variable task #361

GAM, modification of nesting of models and clean up, task #361

Kriging, adding LST for co-kriging: task #364

Kriging, slight modification and clean up, task #364

Kriging, modification to save kriged surfaces in geotiff and png files, task #364

Kriging, modifying code to save training and testing samples in shapefiles: task #364

Kriging for OR, this is the first script, task #364

GWR modified code to save plots and images, task #364

GWR assessment by visualizing residuals using kriging

GWR in adding loop for 10 dates

GWR first script for one date in OR, task #364

Initial commit

Added 3 new models and nesting to GAM, task #361

Changes in the diagnostics plots, barplots.

Transform aspect in Eastness and Northness variables in the GAM.

Transformed the aspect variable and added GAM model closer to PRISM

GAM prediction added to the loop with RMSE calculation

Streamlining and slight changes to the loop to create subset dataset for different dates

Additional changes to the loop and format

Start of Task #361, modified code to subset for 10 dates

Minor format changes and clean up to code

Corrected errors in RMSE calculation and added plots to view results

made minor changes to PRISM variables

changed RMSE and AIC code in GAM script

updated GAM script for tmax

added initial R script with GAM regression for tmax (one date)

cleaned up file permissions

added in various previously uncommitted scripts