Rev 1395: Support decoration of commands. in /home/robertc/source/baz/bzr-integration

------------------------------------------------------------
revno: 1395
revision-id: robertc at robertcollins.net-20051030014016-98a4fba7d6a4176c
parent: robertc at robertcollins.net-20051030000009-9db99a338a0dfdac
committer: Robert Collins <robertc at robertcollins.net>
timestamp: Sat 2005-10-29 21:40:16 -0400
message:
  Support decoration of commands.
  
  Commands.register_command now takes an optional flag to signal that the
  registrant is planning to decorate an existing command. When given
  multiple plugins registering a command is not an error, and the original
  command class (whether built in or a plugin based one) is returned to the
  caller. There is a new error 'MustUseDecorated' for signalling when a
  wrapping command should switch to the original version. (Robert Collins)
  
modified:
  NEWS                           NEWS-20050323055033-4e00b5db738777ff
  bzrlib/commands.py             bzr.py-20050309040720-d10f4714595cf8c3
  bzrlib/errors.py               errors.py-20050309040759-20512168c4e14fbd
  bzrlib/plugin.py               plugin.py-20050622060424-829b654519533d69
  bzrlib/selftest/testplugins.py plugins.py-20050622075746-32002b55e5e943e9