Fixes and improvements for v2.0-rc10

[tve]

Highly desirable:

• add /dev/ttyGPS to gpsd when creating the symlink
• gestures detection of HATs needs to be dependent on udev discovery of devices
• improve update/upgrade process UI (needs better feedback)
• improve bulk deployment process (input welcome!)
• turn hotspot off automatically, offer "off", "on", "20m@boot"?
• make gpsd polling quicker at start-up, try to fix "no-dev" shown
• add monitoring of tags detected to SG Hub
• support remote commands via SG hub, start with remote reboot, restart sg-control, hotspot on/off; include option to disable all remote commands

Desired by users:

• drop short name altogether (I'll leave the code in so it can be brought back easily if desired)
• display rpi version
• separate panes for lotek/ctt radio information
• separate widgets for lotek pulses vs tags
• display lotek pulse rate as "average rate of pulses per hour"
• display longer term pulse rates (have to work out details, perhaps daily for last 30 days, need to try some alternatives)
• display longer term noise floor readings (that info is not currently available from the radio unless there is a pulse detection)
• split detections (lotek/ctt) and per-antenna on SGhub
• show USB/radio ports timeline in SG web ui
• show reboot timeline in SG web ui
• ensure detection counts are per hour for consistency

Desirable:

• add more help info to widgets in the web interface
• fix formatting of widget info
• add monitoring of upload errors (is what's there enough?)
• improve sg-control install (avoid compilation of pam module)
• sleep GPS polling if gpsd produces ECONNREFUSED, i.e. it's not running
• do not print connectivity check failure every time (2 lines!)
• start data files with radio freq
• start data files with some random stuff or SG-ID (remember why?)
• remove session id in HTTP auth for FlexDash
• captive portal browser on MacOS doesn't show plots or allow download, safari works fine
• show ports for radios on timeline plot
• add "data cap" (idea needs fleshing out)
• Adafruit GPS seems to show "no-dev" right after boot until is gets a fix
• Display which software track the SG is on (stable vs testing)
• When configuring Client WiFi from hostspo, add warning that hotspot will briefly turn off.
• avoid shipping dup log file at midnight
• add button to perform connectivity check