Feature request: persistently delete files

[mthome]

avc doesn't track the deletion of files - that is, when you remove a file, it merely removes it from the current commit set. This can be problematic when you have multiple collaborating users or multiple working directories.

Example:

1. On computer X, create file A in avc repository and push it.
2. On computer Y, pull the repository. Note that file A exists.
3. On computer X, remove file A and push the update. A is not in the commit and isn't in the working directory.
4. on computer Y, pull the repository. Note that file A still exists. If Y pushes without manually removing file A, file A will reappear in the repository.