ENH: Use MOD skill to enable MOD check in

[jschrempp]

Today the MOD permission has to be granted by SQL access to the FDB. This means only a DBA can grant MOD permission.

We could create a skill in Amilia called "RFID: MOD". When a user taps in the firmware gets their skill list from Amilia. It could pass skills to the FDB with the call to checkin/out and the FDB could update the MOD_Eligible flag in the clientInfo table.

With this change, any Amilia administrator with access to Skills could change the MOD permission.

(Additionally, we use the display_classes field in the FDB to decide how to decorate a person's div in the checkin screen - for example, "staff" results in a magenta border. We could use Amilia Skills to set this field too.)

[BobGlicksman]

I wonder if too many admins have the ability to add skills for this to work. I wonder if we can somehow create a limited permission group in Amilia so that only the head MOD, the ED and perhaps one or two others could edit the MOD eligible list.