make pthread__sp unsigned long.

Remove unused code that's confusing when using cscope/opengrok.

Remove clause 3 and 4 from TNF licenses

Remove leading __ from __(const|inline|signed|volatile) -- it is obsolete.

Catch up with changes to __fpregset_t.
In __longjmp14(), copy the FP CSR from the correct array and array slot.

Completes fix for PR port-mips/25942.

Hide the register number constants behind an _R_ prefix, and also
rename FPBASE to _FPBASE, so that we avoid polluting the user's
name space when e.g. <sys/ptrace.h> is included. Previously, the
PC

Hide the register number constants behind an _R_ prefix, and also
rename FPBASE to _FPBASE, so that we avoid polluting the user's
name space when e.g. <sys/ptrace.h> is included. Previously, the
PC symbol in mips/regnum.h would conflict with the declaration of
the external variable by the same name in termcap.h, as discovered
by the ``okheaders'' regression test.

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STACKSPACE of 16 is too small, given the use of CALLFRAME_SIZ;
increase to match.

Merge the nathanw_sa branch.