[PD-dev] improved alsa sequencer midi support

[IOhannes m zmoelnig]

> 
> attached is an improved version of the alsa-sequencer
> support, that automatically connects each available device
> to/from pd.
> (note: currently it only connects if pd opens just 1 port)
> this eliminates the need for "external" helpers, like the
> [aconnect]-external, aconnect, aconnectgui or qjackctl

i talked to various people (e.g. fernando (of CCRMA fame) at the ICMC) 
and all of them agreed that it is a bad thing, that pd doesn't work out 
of the box with already connected alsa-sequencer devices.
so i have added this autoconnector, which tries to connect all available 
midi-sources to the pd-in and all pd-out to all available midi-destinations.

i have done it in such way, that the autoconnection only takes place 
when there is just 1 port (input and output are handled separately; so 
if you have 2 midi-in ports and 1 midi-out port, pd will automatically 
send to all midi-destinations it finds; in this case, the midi-in still 
has to be manually connected)

currently there is no real way, how to turn that feature off (apart from 
requesting multiple ports, so no autoconnection takes place)

i hope this is ok.

> 
> furthermore i found and fixed some, namely reverting the
> number of in and out devices.

requesting 3 midi-in devices resulted in opening 3 midi source-ports 
(which are really midi-outs)

the patch can be found at 
https://sourceforge.net/tracker/index.php?func=detail&aid=1060511&group_id=55736&atid=478072
(i just re-opened the old thread for natice alsa sequencer support)


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IOhannes