string-strip 1.2

[Andreas Röhler]

Hi, 

herewith I send a string-strip utility. 

It results from a discussion at

http://lists.gnu.org/archive/html/emacs-devel/2006-06/msg00428.html

Conceived to remove whitespaces from the beginning and
end of a string, it's able to remove all specified
chars from the ends of a string whose contents might
also specified freely.

It makes writing a little bit faster occasionally.

What about a patch against subr.el?

Andreas Röhler
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