Add VACATION :seconds support

[Philipp Hahn]

Hello,

Am Dienstag 08 Mai 2012 13:47:46 schrieb Дилян Палаузов:
> Extending sieve_listextensions() probably requires adding
> "vacation-seconds" in "sieve_extensions" in lib/imapoptions.

There is one small problem: "vacation-seconds" contains a dash, which 
config2header converts verbatim into the enum-name 
IMAP_ENUM_SIEVE_EXTENSIONS_VACATION-SECONDS.
I can either use an underscore in the list of extensions or patch 
config2header to replace '[^_0-9A-Za-z]' with '_'. Opinions?

BYtE
Philipp
-- 
Philipp Hahn           Open Source Software Engineer      hahn at univention.de
Univention GmbH        be open.                       fon: +49 421 22 232- 0
Mary-Somerville-Str.1  D-28359 Bremen                 fax: +49 421 22 232-99
                                                   http://www.univention.de/
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