have, but ignore, file?

[Kyle Nitzsche]

Hi,

I need to have a file in a branch that is changed by various build and merge 
processes. (ok, it is lots of files in lots of branches.)

I don't want to keep those crufty changes, nor do I want to have to revert the 
file manually. I want them auto-ignored.

Now and then, I want to intentionally change the file and keep that new version.

So anyone who gets the branch gets the correct version, and all intermediate 
cruft is auto-ignored.

So I want to have the file in bzr, but ignore until I say: commit this version.

Supported?

Thanks,
Kyle