optimize rotary stage speed calculation for fly scan

[prjemian]

We can rotate the sample stage faster than the current calculation provides. The user wants to specify acquire_time (exposure time for each image frame) based on signal and noise. We want o minimize the angular blur that is a consequence of acquiring an image frame while the sample stage is rotating. But, we want to acquire a full tomo dataset as fast as possible.

How much blur is acceptable? A good starting estimate is no more than 0.1 pixel/frame.

The algorithm is:

• user specifies acquire_time (based on signal and noise)
• assign blur of 0.1
• calculate rotation speed, limited to 0.5 <= speed < 30 degrees/s
• calculate blur with constrained speed

NOTE: Implementation depends on completion of #37

[prjemian]

can solve this with no beam, move to later milestone

[prjemian]

@decarlof : deposit example code here

[decarlof]

@prjemian here it is

[prjemian]

@decarlof : Good, I'll use those functions directly (as can be) in the mona/bluesky code