Long paths, hitting MAX_PATH limit of 260 chars

[Bernhard Reiter]

Windows seems to have a limit of 260 chars in a paths
and with Kontact's imap cache we are hitting the limit if there are too many 
subfolder. I am wondering if these limits are hit by other components
as well and if using the extended-paths of windows, starting 
with "\\?\" would be a solution to the problem.

Technical details and hints about the problem we've hit:
https://www.intevation.de/roundup/kolab/issue3582 (Errors with too 
long/reserved/case-sensitive file names)
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