* The check for valid sdcard paths has been removed (because it
doesn't make sense for /dev/sd*, this might as well be a real
harddrive)
* New check: abort if any partition of the sdcard is mounted
* Automatically detect if the partitions are called "p1", "p2" etc.
or just "1", "2" etc. (/dev/sda1 vs. /dev/mmcblk0p1)
* pmb.helpers.mount.ismount(): check the source (new) and the target
path in /proc/mounts
9d4bc61545