[log, merge] Allow selecting revisions with/without bugs #95
Description
Right now --bugs option has mandatory value, where bugs are specified. This will show revisions, associated with already known bugs.
For cases, when bug isn't known it's impossible to filter out only:
- all revisions, that have bugs association
- all revisions, that don't have bugs association
Adding 2 special values to --bugs option should accomplish this:
all- get all revisions, that have bugsnone- get all revisions, that don't have bugs