closes #601987 1) sqlutils.restore_from_file have to use its confirm argument when a command fail, to propose to continue there (this can't be handled by the caller) 2) source.restore method hence needs to take this confirmation callback as argument 3) properly fix places where 'drop' was given instead of 'confirm'

missing one litle char

closes #607344 by simply appending '/' to base url if necessary instead of insulting the user

cleanup

test update. All cw tests OK

fix bad merge

make groupmap argument optional / sort for testing purpose