Remember widow size and position

[alexkay]

Moved from https://code.google.com/p/spek/issues/detail?id=41

[alekksander]

would be very helpful

[byblo]

I second this request :) (win64)

[metsamees]

I too come here to request that it could be made to allways open up maximized (to save me an extra click (and re-process) every time I want to check an audio file). And an average bitrate for FLAC file would be really handy indeed (like allready requested). But still, this program really is a masterpiece - not only loads files super fast but provides high quality/high resolution fullscreen spectrogram!