G/C the unused kernel-only CLK_TCK #define.

XXX: does include/time.h still need <machine/limits.h>?

- Fix RCS Ids.
- Spacing.
- Protect from multiple inclusion in a consistant way (except on headers
that do nothing except function as mips header wrappers).

multiple include protect machine/limits.h, fixes pr 4473 (from Mika Nystrom)

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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Remove pmax-specific CLK_TICK to prepare for moving to sys/arch/mips.

KERNEL -> _KERNEL

put #ifdef KERNEL around CLK_TCK define

new RCS ID format.

Add constants required by XPG3

bsd 4.4-lite pmax port as ported to NetBSD

upgrade to bsd 4.4-lite code base. only mod is rcsids

some pmax updating (Terry Friedrichsen is helping on this now).

pmax code from <ralphc@pyramid.com> & <rick@snowhite.cis.uoguelph.ca>