pbarrier.c: Comment clean up
pspin.c: Comment clean up
muteximpl.h: Comment clean up
ptimer.h: Comment clean up
condimpl.h: Comment clean up
mqueueimpl.h: Comment clean up
semaphoreimpl.h: Comment clean up
timerimpl.h: Comment clean up
signalcatch.c: Remove junk comment
posix/config.h: Comment clean up
pthread.c: Remove XXX and use SIGNAL_ constants
psignalimpl.h: Remove dead comment
condwaitsupp.c: Return EPERM if waiting and mutex is not locked

This error check was commented out because it is not in the POSIX
specification. However, the GNU/Linux manual page does document
that EPERM is to be returned in this situation.
pthread.c: Use UINT32_MAX rather than constant value
alarm.c: Per comment add debug code for kill() failing

This is highly unlikely and would indicate a serious bug
in the system or corruption. But it is better to be cautious.
Merge branch 'master' into am