Updated.
Updated news file.
Add a 'make clean' target (issue #54).
Updated readme.
Add some basic markup
Update with new file name.
Reduce default FFT size to allow higher rates.
Merge branch 'master' of github.com:csete/gqrx
New I/Q DC cancelling and swapping implementation.
Add on/off switch for automatic DC cancelling.
Move input device settings I/O to DockInputCtl.
Store receiver settings (issue #58).

Following settings are saved:
- Demodulator (mode)
- Filter offset
- Squelch level
Update news.txt
Use 1 second time constant for DC correcftion.
No need to calculate sample period for DC correction.
Merge branch 'master' into fft_filter