Preliminary work to add input event on a named pipe.
Another brick in the wall of remote command. Camera connection
must be tested as yet.
Add message for newly available preview image when capture was
run from fifo.
It's much wiser to disable stout buffer when used from popen
which is likely when run with -f parameter ;-)
Add a feature to save histogram data to a text file.
GETPREVIEW from fifo will save both on /tmp/<fifoname>.jpg/.txt
Add appropriate acnowledge for all commands, add new:
READMAXADU, READMINADU, GETPRVWIDTH, GETPRVHEIGHT, GETDATADEPTH
"Fifo: PREVIEW=New preview image available" every time the image
is redrawn for whatever reason (new one, ADU, debayer)
Fit Header fix:
- change pixel size keys
- add EXPOSURE key
- add SET-TEMP key
Add feature to enable (from fifo) jpg save together with avi/fit
Fix preview showing only B/W for QHY5L-II
Add -F parameter for custom named pipe path/name
Merge branch 'namedpipes'
Add remote control on a fifo, integration with iAstroHub
already tested (http://sourceforge.net/projects/iastrohub/).
Fit Header fix:
	- change pixel size keys
	- add EXPOSURE key
	- add SET-TEMP key
	- Adapted a few key to be more compatible