Default 'runtime settings' values & routines

A single loop in set() now maintains all runtime default values like
pause defaultdatatype interval maxItemsPerPost. defaultdatacodes now
have a default set in the listener code so for example the Jeelistener
now has a default of 'h' set so any jeelistener will default to ints if
a default not set in conf. maxItemsToPost range of 1-250 enforced, 1 by
default (just add 100 to listener in emonhub.conf to enable bulk upload)
default value could be set in listener init() if essential.  Any runtime
settings changed will trigger a log entry. Interval value available to
all listeners and dispatchers to provide for delayed seending and/or
timed querying etc rfm2pi's 'sendtimeinterval' is therefore just
'interval' now. these values can be overridden just by adding a
runtimesetting in emonhub.conf and any runtime settings deleted will
rever to default value.
Broadcast time now shows leading zero's in log entry (5mins past 2am is
now 02:05 not 2:5)
Revert "Default 'runtime settings' values & routines"

This reverts commit b73e78630160d5572a482642d5917dcdce54861d.
Revert "Revert "Default 'runtime settings' values & routines""

This reverts commit 4bb2cedd1430c390acf4c1d25e3aa218e5d0c058.