Write a basic imaging function for the ZWO cameras.

[julesfowler]

Give the students a basic function to take an image.

Right now HiCAT is set up superbly and includes a lot of system-wide safety checks that make it somewhat tedious to take a real image if you only want to kidnap a piece of that architecture.

I need to rip out the simplest form of taking a single exposure with the ZWO brand cameras, and make it usable.

I've been hacking away at this but a recap of everything involved and what is left...

• Isolate where in hicat-package the exposures are taken at the lowest level.
• The answer is in the hardware specific section in the ZWOLib.py interface.
• Find the background camera lib file needed to run the zwoasi architecture.
• Comes with the hicat-package. We can move it somewhere more sensible when the time comes.
• Write a basic function that instantiates the camera and takes an exposure.
• Make it nicer with a class.
• Add in error handling and neat logging.
• Fun issue wherein closing the camera does not clear the instantiation of the library file, but that's been fixed.
• Test it on the lab side.
• Make it specific to the camera or cameras that we'll be using.

[julesfowler]

This is addressed in #9