- Copy stable/10@296371 to releng/10.3 in preparation for 10.3-RC1
builds.
- Update newvers.sh to reflect RC1.
- Update __FreeBSD_version to reflect 10.3.
- Update default pkg(8) configuration to use the quarterly branch.

Approved by: re (implicit)

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

- Rename pcb_fpstate to pcb_ufp (user floating point), and change it to
a simple array of 64 ints.
- Use a critical section when saving floating point state in cpu_fork
instead of sched_lock.

Remove code from trap which is handled in userland now.

Change fpblock to be an array of ints instead longs.
Change fp_init_thread to take a thread instead of a pcb so we
can get at the trapframe.

1. Split fp.h into fp.h and fsr.h so that the latter can be included
in asm files.
2. Temporarily cause subnormal operands in floating point operations
to be treated as zeros so that comlpetion of the operation does not
need to be emulated.
3. Catch fp_exception_other and correctly skip over the unfinished
instruction, but basically ignore them. Emulating the instruction
is not yet supported.
4. Zero td_retval[1] as well in syscall().

Submitted by: tmm (2, 3)

KSE Milestone 2
Note ALL MODULES MUST BE RECOMPILED
make the kernel aware that there are smaller units of scheduling than the
process. (but only allow one thread per process at this time).
This is functionally equivalent to teh previousl -current except
that there is a thread associated with each process.

Sorry john! (your next MFC will be a doosie!)

Reviewed by: peter@freebsd.org, dillon@freebsd.org

X-MFC after: ha ha ha ha

style(9) the structure definitions.

Rename fp_init_pcb to fp_init_proc. Set the FEF bit in fprs register;
according the SCD it should be set if no user trap handler in set.

Submitted by: tmm

Correct copyright language.

Sigh. Add two files needed for the sparc64 fp contect switching code
that were forgotten in the last commit.

Pointy hat to: tmm