Increase waterlevel constraint

Increasing the constraint of the waterlevel from 100 to 200
Switch from Water change to Feed mode

Make it possible to change mode directly from Water change to Feed mode
Merge branch 'waterlevel_constraint' of git://github.com/phrusher/Libraries.git into dev
Merge branch 'wifi_changemode' of git://github.com/phrusher/Libraries.git into dev