fix gps errors output lon & lat for each facility and remove those without proper ones
Data Caveats. Closes #238
Merge pull request #244 from SEL-Columbia/gps_validation

fix gps errors output lon & lat for each facility and remove those witho...
Merge branch 'master' of https://github.com/SEL-Columbia/nmis
Integrates spatial outlier filtering to the nmis pipeline.

This commit rearranges the pipeline such that operations are performed
on all sectors allowing a dataframe of all facilities to be filtered for
spatial ouliers. Additional libraries needed for filtering were added to
the readme file, and the makefile was extended for the additional
sources.
dbsync now ensures facility ids
adds plotting functionality to the cluster_lga function for debugging/visualization purposes
adds plotting functionality
incorporates Zaiming's gps_validation step
cleaned the codebase: encapsulated the spatial_outlier stuff to a function call, suppressed NA coercion warnings, added comments and brought back the CONFIG.R.example