Clean up.

Nuke register and remove trailling white space.

RCSID Police.

Replace the following header files from src/sys/arch/pmax/include/
with versions that include equivalent files from <mips/include>.
(cvs magic copied the previous revisions, with history, to
src/

Replace the following header files from src/sys/arch/pmax/include/
with versions that include equivalent files from <mips/include>.
(cvs magic copied the previous revisions, with history, to
src/sys/arch/mips/include).

bsd-aout.h elf.h endian.h exec.h float.h ieeefp.h limit.h pcb.h proc.h
profile.h reg.h regdef.h setjmp.h stdarg.h vmparam.h

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NetBSD's ieee FP definitions for the pmax are valid for other mips cpus;
change preprocessor XXX_PMAX_YYY #defines to XXX_MIPS_YYY.

Mips specific portions of ieeefp.h (fp_rnd, fp_except, constants, etc.).