Allow control of a FatFs config flag from app

Allow the application control the state of the REALTIME FatFs flag (trades off execution speed for program memory) by defining FATFS_REALTIME
i.e. in the apps Makefile
CFLAGS += -DFATFS_REALTIME=0
Update to FastClockP to fix TimerA speed issue

Maintain the speed of TimerA to 1MHz when the speed of SMCLK changes
By modifying TimerA's input divider
Required because a number of components assume TimerA is 1MHz
BLIP printf small fix

If PRINTFUART is not defined, blip_printf.h now correctly removes all
the printf functions. printf_ieee154addr() was not being removed but
that wasn't a problem because it isn't called anywhere. But, if someone
did want to use it, their code would not compile with printf debugging
turned off.
Merge pull request #213 from lab11/blip-printf-bugfix

BLIP printf() Small Fix
modifications for ucmini v2.0; default version is ucmini2; older versions can be used with UCMINI_REV variable
added missing ArbiterInfo interface