Backport items for 0.1.2:
  o r10939: Choose with complete fairness when exits are weighted.
  o r10956: fix the math for exit bandwidth weighting
  o r10994: Disable SENTINELS checking in order to use less RAM in
    buffer allocation.
  o r11117: cookie auth more usable
  o disable v0 control protocol
  o r11138: PROTOCOLINFO support.
  D r11141: CookieAuthFile and CookieAuthFileGroupReadable.


Backport for 0.1.2.x once better tested:
  - r10579: new addsysuser implementation for osx (??)
  - Some fix for bug 438 (??)
  - coderman's constrained socket buffers patch (r10843)
  o r10964: control.c grammar conformance. could conceivably break
    old controllers that were relying on non-conformance.