as either:
<topbloke patch name>
- <ref name including refs/heads/>
- exist only in base branch
+ exists only in base branch
deleted exists (but empty) if patch is deleted
- exist only in tip branch
+ exists only in tip branch
topgit- name of the topgit branch that this was
imported from and which we should merge from
(plus a newline)
- exist only in base branch
+ exists only in base branch
[^+]*- another property that applies to this patch;
if not known to this version of topbloke then it