add filter to `dvs_status`

[CGMossa]

a glob filter to show status within a directory, or all nested directories. dvs_status("*") and dvs_status("**/*") resp.

[Keats]

Is that needed?

[CGMossa]

I have no clue, but in the spirit of helpful, higher level uses through the r-pacakge, this is one such idea. Also, I've noticed that a file name is not sufficient to _get, which means that if a project have datafiles identifiable solely by name.. that's not going to mesh well either.

[CGMossa]

dvs filters was a good idea, well received. It won't be in the initial rewrite of dvs, so I will close this issue for now.

[CGMossa]

A draft PR for this feature is #37. filters, in the sense of filtering the output of dvs status was implemented in #40.