SOPE 4.5.6 Release (alpha)

SOPE 4.5.6 is the sixth official trunk snapshot (alpha) of the upcoming SOPE 4.6.
This release mostly fixes bugs in SOPE 4.5.5. Issues got fixed in quoted printable handling. A lot of LDAP related issues got fixed. Support for Windows style WebDAV was improved. GCC 4.0 warnings got fixed. Please check the changes file for details.
Bug reports touched by this release are #995, #1588, #1624, #1590 and #1568.
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