make running from different directory.

Add the directory where multicd is located and its plugins/ subdirectory to
the PATH.

Signed-off-by: isaacschemm@gmail.com <isaacschemm@gmail.com>
make sure EXIT trap is run on error.

Signed-off-by: isaacschemm@gmail.com <isaacschemm@gmail.com>
Fix commands to enable MCDDIR value with spaces in it
Fix typo that was causing everything after GRML to be in the GRML menu