Fixed setpIO to use new second based timers
Changd name of setRTCStatus to writeRTCStatus.  This is to establish a convention that get and set functions are local and read and write functions involve messages to/from the R420.
Added saveSettings to setAnalogSource so instrument reinitialised to use the new settings
K400:  New features to manage SETP status along with IO status.
Callbacks are now possible on entire IO or SETP status and also for individual status bits
Improved checking for events triggered before previous handler finished for the same event
rinCON setSerBCallback comments corrected.