Continued work on pipeline, Eyeball, Peck and general mating permissions.

There's now a webpage to show pipeline status.  In addition I created a little
graphic to indicate that a sensor is waiting to mate (when user permission is
required).

I modified the database table for the sensor, changing manid, modnum and sn from
INT to VARCHAR as it doesn't really make sense to convert a hex string into a
decimal integer.

Pipelining (done last week) isn't as great as I thought.  There wasn't enough
consideration given to how/where to store sensor data during the mating process.
Hence the entire pipeline concept is being expanded to include other existing
tables to store the data.  This means more clean up when sensors don't complete
the mating process.  Much of that has been added, but it's not complete yet.

To consider next: How do we handle the list of manufacturer id's -> names? Do we
want to address modnum similarly?  Once that's figured out, get mate.php going.
Merge branch 'master' of github.com:squidpie/sansgrid