[merge][#251352] better messages for illegal 'log -m' arguments

[John Arbash Meinel]

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Martin Pool wrote:
> Based on Anne Mohsen's patch in
> <https://bugs.edge.launchpad.net/bzr/+bug/251352> this gives a nicer
> message when the user gives an illegal regexp.  (Thanks, Anne.)  It
> also separates out a function re_compile_checked that we should use
> whenever compiling a user-supplied regexp because the python default
> error is not very helpful.
> 
> I haven't added this into the ignore code (yet) because it's not
> directly applicable and that code already makes some effort not to
> compile them one by one for the sake of speed.
> 
> 

BB:approve

John
=:->

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