provide a means to pass additional commands to lftp (e.g. "set net:limit-rate 50000")
[booh] / bin /
drwxr-xr-x   ..
-rw-r--r-- 4896 album2booh
-rw-r--r-- 234295 booh
-rw-r--r-- 76962 booh-backend
-rw-r--r-- 77695 booh-classifier
-rw-r--r-- 1022 booh-fix-whitebalance
-rw-r--r-- 1022 booh-gamma-correction
-rw-r--r-- 4770 webalbum2booh