fix ownership of gain control layout
Merge pull request #119 from pinkavaj/fix_layout_00

fix ownership of gain control layout. The ownership of the layout is taken by parent layout at insertLayout(...)
Added stub of peak-detection feature
Added UI for peak detection
Documentation
Fixes, cleanup and peak snapping
Added stub of peak-hold
Add sample rates for BladeRF and Netsdr.

Patch from Dimitri Stolnikov.
Merge pull request #121 from Steven--/peak-detection

Adds peak detection to FFT plot.
Updated.
Merge branch 'master' into peak-hold

Conflicts:
	applications/gqrx/mainwindow.cpp
	applications/gqrx/mainwindow.h
	qtgui/dockfft.cpp
	qtgui/dockfft.h
	qtgui/dockfft.ui
	qtgui/plotter.cpp
	qtgui/plotter.h
Merge pull request #124 from Steven--/peak-hold

Adds peak hold to the FFT plot.
Update news and readme.
Do not allow audio playback unless DSP is running.

Closes #122.
Add basic network streaming of audio over UDP.

The audio output of the receiver can now be streamed to a spefied host and
port using UDP. Currently only one channel is streamed using 48 kHz sample
rate. The audio is converted to short (S16LE) and a client side command
line could be:

  nc -l -u 7355 | aplay -r 48k -f S16_LE -t raw -c 1
Better color gradient for the waterfall.
Add icon for network button.
Small adjustment of default FFT colors.
Implement remote control interface.

This change set implements a hamlib/rigtctld compatible control interface
that allows setting and reading the current frequency. This is a simple TCP
socket using plain text commands and can be tested using telnet. For the
time being only connections from localhost and on port 7356 are accepted.
Move AFSK decoder to Tools menu.