[imp] Quota/logfile.php

[Tim Gorter]

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Attached is a driver for Quota extradition from a log file.
horde/imp/lib/Quota/logfile.php

It basically extracts the Quota information from a server logfile. This is for 
when get_imap_quota is not supported. This basically looks at the tail of the 
logfile (may it be messages or similar) and extracts the info needed.
all parameters needed are listed at the top of the file.

Do note that for this to work your logfile needs to be readable, and thus you 
may want to adjust how your server keeps your logs.

cheers,
tim.
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