added INCRP macro - now does 32-bit increments of RP for speed
added ADDRP macro to return RP incremented by n (CGT)
changed globals to static (didn't help speed much - thought it might)
moved around some functions
changed shift instructions to create bitmask at runtime (faster)
manually inlined mathexception (but used inline keyword in later revs)
changed get16/put16 to get16t/put16t where address trap might occur
this eliminates ea<0 test for all other non-trappable get16/put16 calls
changed crs & crsl to macros to reference a union vs 2 distinct variables
changed crs and RP to be register variables (regs.h)
fixed tape drive problems
for R-mode MPY, do the math THEN generate the exception
DIV exception handling was wrong, code was wrong too
a few devasr changes
changed devamlc to always turn off parity instead of flipping it
writes tracing to a buffered log file instead of stderr
added clear of first 32K of physical memory to master clear
changed all exit() calls to fatal() calls
more changes to the devmt tape driver
