i cherry-picked some fixes from experimental into release_2_0
please have a really close look on the changes introduced with commit #1339
what i'm especially unsure about is the fix in importmidi.cpp:
muse used to read the pitch for some drum-channel-note, and used
drumInmap to map it. i changed this to drumOutmap, because we don't want
"e-note-mapping", but we actually want the resulting note to be played
as $pitch (we do not want the resulting note "as if it was recorded as
$pitch"). and drumOutmap imho does this, and not drumInmap.
just double-check, okay :)?