Remove debug code.
Resolve issue with battery status being lost on stack.
Battery status variable moved to DSRTC driver.
Fix build failures for DSRTCENABLE=FALSE (spk.asm requires dsrtc)
Implemented a shadow copy of the RTC port value to enable multiple drivers to share the port without causing side effects to other drivers that use other bits of the RTC port.
For systems which use Super capacitor or rechargable battery, trickle charge status is displayed. Good for users with ECB-RAMF for example. Trickle charge can be turned on/off with the RTC.COM utility and the status set will now be display at boot time.
