release-3.2

• braid.mtimes acting on loops is now multithreaded.
• braid.braid can generate normally-distributed random braids
• braid.subbraid now has a C++ implementation.
• loop.plot takes the option 'BasePointColor'.
• Added troubleshooting appendix to braidlab guide, which describes
  global flags and issue reporting.
• Bugfix: prevent creation of empty loop with loop([]), or equivalently a
  loop with two punctures with loop(2), or a loop with one puncture and a
  basepoint with loop(1,'BasePoint').
• Bugfix: disallow passing of nonincreasing time vector to databraid.
• Bugfix: disallow inf and NaN when creating braid from generator list.
• Various other small bugfixes.