get rid of couch_aadt

death to files I am not using.  They just confuse me when I come back
to code after a long hiatus.

couch_aadt is no longer being used because it is folded into code
embedded in couch_file, where I compute aadt doing a reduce and so
on.
added words about trigger_R_gridwork.js to README
tiny adds to README
Documenting getallthegrids.R

modified:   README.md

this symlink is not needed as I pull in this lib via component
 deleted:    Rwork/safetylib
Merge branch 'feature/cleanup_js'

pull this in for now, open up a new branch later when I do more
documentation stuff