Feature start now computes the feature-branch pom-version from the feature name.
Feature name is expected to be the issue id from JIRA (or BugZilla or ...); it is
expected to be of format $PROJECT_NAME-$ISSUE_ID.  The 3rd number in the project-version
is set to '1####' where #### is $ISSUE_ID.
'keep' flag defaults to true for hotfix and release finish commands, and BOTH
local and remote branches are kept (or deleted if keep is false).