Added in new XML tags

- 4 channel water level
- humidity
- leak detector
Added in second set of expansion modules bit EM1
Added ability to handle the 4 port water level expansion

Added in xml processing for the values and labels for the 4 port WL
Added fields to the db tables
Improved database table upgrades
Removed comment from notification table class
changed db version to 7
Store WL 1-4 values in the database
Added in 4 channel water level displaying

added rows to controller page for each channel
added preference label setting
added preference visibility setting
added auto toggle for enabling/disabling water level expansion (1 channel and 4 channel are not distinguishable as to which is enabled. if water level expansion is enabled, you get all 5 channels displayed and you must toggle the visibility of the ports you wish to see.)
Added Water Level 1-4 to Notifications
Completed adding 4 channel water level displaying

Updated changelog
closes #30