added fine control on top of x-resolution presets and display of effective crop factor
Created originally on Bitbucket by rbrune (Rafael Brune)
Was already merged in Bitbucket before import, marked as merged by the import user
The resolution presets of mlv_rec are quite coarse but at the same time having uses step through all multiples of 32 pixels by hand is also no solution - so I implemented a way to increase/decrease the preset resolutions by multiples of 32 allowing for more fine grained control of the resolution.
Additionally I also added an effective crop factor display to the resolution menu entry which should help with getting the desired field of view and depth of field for a shoot.