[MERGE] bzr help locationspec

[Robert Collins]

Robert Collins has voted +1 (conditional).
Status is now: Semi-approved
Comment:
This looks good to me, though I think it would be good to also:
  * Add a NEWS entry
  * Add a TODO entry to query the transports
  * do a sweep through the builtins and add references to locationspec 
help, or some other thing to serve as a link from e.g. push to help 
locationspec.

For details, see: 
http://bundlebuggy.aaronbentley.com/request/%3C20070115222632.GB12929%40fridge.pov.lt%3E