Changes as of Friday

Not as much progress as I'd like, because I burned hours on investigating #125 (see there for significant discussion)

* Images sent over the science stream now have a full header and are fully compatible Kurt's reassembler program
* Header now includes two booleans for whether the SAS was tracking for that image and whether that particular computer was outputting (or trying to output) solutions to CTL
* Solutions to CTL are not sent out if the slopes in the mapping are clearly wrong (too far from the nominal ~5.7–5.8)
* Changed all the header tag names, for both saved and sent images, to be no more than 8 characters to fit in the allocated space in the HEROES specification.  This means that any analysis software written will need to distinguish between any old headers (e.g., a Sun test) and the newer headers.

Merging immediately