ffado-mixer: make the vertical size policy of the panelmanagerstatus widget 'minimum' and set the minimum height to 0 (was 200).  With the original settings the status widget claimed a fixed height of 200 pixels even if it was hidden, which in turn caused ffado-mixer's window to default to a height which was 200 pixels larger than necessary.

git-svn-id: svn+ssh://ffado.org/ffado/trunk@2292 2be59082-3212-0410-8809-b0798e1608f0
ffado-mixer: prevent the ffado mixer window being sized to include the hidden status widget.

git-svn-id: svn+ssh://ffado.org/ffado/trunk@2293 2be59082-3212-0410-8809-b0798e1608f0
rme: ensure that hidden controls don't contribute when determining the mixer's vertical size.

git-svn-id: svn+ssh://ffado.org/ffado/trunk@2294 2be59082-3212-0410-8809-b0798e1608f0
rme: clarify a comment in the mixer code.  With r2294, the vertical sizing issues noted in the commit message of r2291 are more ore less resolved.

git-svn-id: svn+ssh://ffado.org/ffado/trunk@2295 2be59082-3212-0410-8809-b0798e1608f0
rme: implement infrastructure allowing ffado-mixer to trigger flash operations.  Enable the 'Mixer save' button and implement its functionality.  Fix bugs in the mixer flash code.  Update the RME documentation.  With this revision it should be possible to use ffado-mixer to write the mixer state to device flash for automatic restoration when the interface is powered up, although this has only been tested on the FF800.

git-svn-id: svn+ssh://ffado.org/ffado/trunk@2296 2be59082-3212-0410-8809-b0798e1608f0