GUI Enhancements

[dendvz]

Is there any specific reason behind timebase steps 1-2-4-10?

1. Timebase steps 1-2-5-10 are more traditional, have better distribution on log scale

2. dsoWidget: enabled timebase update

3. Added CMakeLists.txt.user to .gitignore

[OliverHaag]

Yes, at least the DSO2090 only got a few record lengths and samplerates that you can choose from. That's why only 1-2-4-10 make sense. 5 would record as much as 10 but throw away half of it while 4 will record with a higher samplerate as far as I remember.

[dendvz]

@OliverHaag We should probably propose two different GUI views (skins?):

1. Device-centric, where acquisition params controlled by user are sample rate and record length. Would make sense to change number of major / minor ticks along X-axis in this mode and completely hide "timebase" spinbox from Horizontal dock.

2. Classical, where Horizontal dock shows only "timebase" spinbox, while sample rate and record length are hidden and calculated by device controller internally. Moreover, the range for timebase spinbox should also be restricted by device capabilities, e.g. 1ns/div is absolutely useless if max device sample rate is 48MS/s - the entire screen is 10ns wide and we can show only 1 sample at trigger position.

BTW, I would also suggest to move "frequency base" spinbox to "Spectrum" dock.

[dendvz]

Closing this one, useful items moved into #86