Add minimum relay on time for PID controller

[kizniche]

There is already a "maximum on time" (titled Up Max and Down Max, for each relay of the PID), that the on time for a relay will not exceed. There needs to be a complementary minimum on time that if the PID does not exceed, the relay does not turn on.

[kizniche]

Added in commit 0ea208d

[kizniche]

Oops. Reopening, as I implemented all but the useful part in the daemon (where it actually checks if the on duration is at least as large as the set value). I'll have to get back to this later, as it's getting late right now. I did check and the web interface and database are working, so editing the daemon should be easy when I get a chance to do it.

[kizniche]

Added min on duration to daemon in commit 163ba15