Revert "aux send: dont force Master to stereo" -- don't need this

This reverts commit c535952566975ea3f083b68e203241c9a9b73481.
remove obsolete field
Insert: new subroutine soundcard_delay($trackname) reports loopback delay
on wet return track that is routed via the soundcard
+ drop backward compatibility for aux track names
+ drop dead latency code
latency fixes. One bug is output port latency settings
are wrong when Mixdown and Master have different
channel counts.
remove test files from repository
promote $project to ::Project object
Project: initialize additional fields in $project
remove redundant man page
doc - Nama is 'digital audio workstation'
propagate_latency(): fix recursion bug
correctly memoize
add get_nama_ports(): JACK-to-Nama ports dictionary
latency looks good

add routines:
- set_capture_latency()
- get_capture_latency()
- start_latency_watcher() # delay this if possible to allow runtime loading

fix:
- read JACK port connections on initiating latency processing, not part of
  jack_update()

next need to:
- recompute latencies
add register_own_ports()
definitively identify own JACK ports
recursion from capture side only
and algorithm is wrong. See http://jackaudio.org/files/jack-latency.png
fix config option press_space_to_start_transport
fix syntax
set_*_latency($min, $max, $port1, $port2...)
IO: out of bounds warning