[PATCH] minor bzr diff improvements

[Chris Mason]

Hello,

Since I'm trying to get a handle on bzr, I picked a somewhat simple task that 
others (probably ;) aren't already working on.

The attached patch allows you to diff between two revisions:

bzr diff -r rev1 -r rev2

It changes the command line parsing to allow multi options for specific 
options in specific commands.  This means bzr diff allows multiple -r options 
but bzr ls does not.

I also changed the file selection code for bzr diff file1 file2 ..., moving 
the check against the file list deeper into the call chain.  It looks to me 
as though bzr is still reading the whole tree even when we're asking to diff 
one or two files.  With this change we're still doing a stat of the tree, but 
it's a start.

Testing has been very light, I'm mostly just trying to get a feel for things 
here.

-chris
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