FEATURE REQ: Make alias for --diff-options

[Jari Aalto]

I find it quite demanding to have to type the extra options 
to diff:

   $ bzr diff --diff-options -bwu -C 5

This is all good for scripts where GNU --long option names are
designed to be used, but for command line use the short forms are
needed. Would it be possible to provide shorted form for command line
use, something like:

   $ bzr diff -o -bwu -C 5
              |
              extra options to diff follow


Jari