Add config switch handler and help message forgotten in 9373ab0d0420f3335ca9793c53ac7f9a92cb3e81, closes #1439 again
make class to use for file upload wrappers configurable, refs #1447
merge 7530c74e2d4f8889de5692fd2bd39b4d20588017...47e5d4b8535d6b8b6577ad10232c6e6cc3efecf9 (from 1.0)