Back to no shapes as default for new ROIs
NF: More compact side bar controls

Features, Objects and Regions tab pages didn't need the dual page layout
so far. Moved the slot tables to the front and removed the lock buttons.
Anti-aliasing for small circles

Smoothing hints don't seem to work for GL_TRIANGLE_FAN. For small
circles (what exactly the limit is, relative or absolute is not clear to
me) it now uses GL_POINT and VBOs instead. Looks nice.
Can now remove features, objects and regions

Major changes. Things are still pretty flaky, I am afraid stuff gets
left behind somewhere, especially in combination of the continued
cluster*** of "slots".
M: 10 tries to retrieve frame should be enough