new way of handling single files
new way of handling single erase-saved
reference multiple files in one pass
multiple diffs in a single pass
fix for an earlier commit
added FIXME remark for later
upload without calling find()
removed find() and find_terse()

because they are hacks
FIXME remark for later
Merge branch 'single' into dev60
Get rid of find() and find_terse() ; use visit() and callbacks
to handle all SINGLE_FILES in one pass.
Also, upload() no longer uses find_terse()
TODO: match terse paths