Pthreads infrastructure -- initial commit

New files: lib/qpthreads.c & .h

  Encapsulates the Pthreads facilities to be used in Quagga.

  Implicitly documents the sub-set of Pthreads being used.

  Provides error checking for a number of functions which may return
  errors, but are not generally expected to and for whom an error is
  treated as fatal.

  Could be modified to "null out" the use of Pthreads.

New files: lib/qtime.c & .h

  Defines a 64-bit integer time value which is a lot easier to
  handle than the usual timespec and timeval structures.  (C99
  requires a 64-bit integer.)

  Provides front ends for gettimeofday() & clock_gettime() which
  return 64-bit time value.  Also conversions to and from timespec and
  timeval.

  Provides a monotonic clock for when CLOCK_MONOTONIC is not available.
  (This is based on code from Joakim Tjernlund.)

New files: lib/heap.c  & .h

  Implements a heap data structure closely allied to the vector.

  This will be used for timer handling.

Modified: lib/memtypes.c

  New memory types for qpthreads structures and for the heap.

Modified: lib/zassert.h

  Added explicit "passert" == assert which is not subject to NDEBUG.

  Added explicit "nassert" == assert which is subject to NDEBUG.

  Added zabort, zabort_errno and zabbort_err for when something has
  gone fatally wrong.  (Require changes to lib/log.c which are TBD.)

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