Add channel switch texts to Text palette and make most instruments
with multiple channels have a name for the 1st channel rather than
fallback to 'normal' (all but harp and the e-basses), having 'open' for
brass, 'arco' for strings, 'pizzicato' for acoustic bass. Add 'mute'
(and' open') channel to all brass using trumpet sound, add 'pop' and
'slap' to bass guitar and 6-string electric bass., add 'mute' to
classical guitar.
Naming unnamed channels, more channels for guitars and bass
and naming the sounds of the channels after GM in comments to the
channels
See also https://musescore.org/en/node/269784 and
https://musescore.org/en/node/278497
There's probably quite a bit more, but these are the most
obvious places.
Impoved the error mssage, with a hint where to get 2.0.
Most of the templates and sample scores had been created with a pre2.0
nightly version, so they have been resaved with 2.0.0. They'll most
probably need to get updated for 3.0 at some point again.
