internalize RVAL2BOXED fix for allowing passing NIL_P (->NULL)
[booh] / bin /
drwxr-xr-x   ..
-rwxr-xr-x 195822 booh
-rwxr-xr-x 58411 booh-backend
-rw-r--r-- 52842 booh-classifier
-rw-r--r-- 1021 booh-fix-whitebalance
-rwxr-xr-x 1021 booh-gamma-correction
-rwxr-xr-x 4768 webalbum2booh