Add all debug statements to date
Small debug line change in base models
Change Foreign Key relationship for ResourceBase and Thumbnail

Prevents duplicate thumbnails when updatelayers is run

Restores lost logic in updatelayers gs_slurp from old bulk merge
Change to properly obtain thumbnail URL in metadata template: full_metadata.xml
Tweaked the debug statements for base/models.py for maps instances
Merge branch 'noaa_dev_debugstmts' into thumbnail_fix_pr_test
Merge branch 'thumbnail_fix_pr' into thumbnail_fix_pr_test