Updated Czech translation
Make libdb optional dependency

Since the file book backend uses sqlite as its summary, the libdb is
needed "only" for migration of old data.
Use OpenLDAP in Win32 builds as well

Even it's another dependency, it should provide more code consistency.
Misceallenous Win32 build related fixes
Bug 721128 - Make Evolution-Data-Server build under Win32
Bug 730827 - Cannot use libphonenumber >= r568
Bug 591811 - Do not re-encode attachments and change CRLF/LF
[IMAPx] 'Error performing IDLE: Shutting down' is not an error

There could be shown the above error on console when closing
an application, but it's not a real error, thus avoid it
being shown.
Bug 227536 - Add "Message Location" filter option
Use g_weak_ref_init/_clear() on structure-allocated GWeakRef-s

Probably not related to bug 698342 that much, but I was told that
the right thing to do is to use g_weak_ref_init/_clear() on
structure-allocated GWeakRef-s, the same way it is done for GMutex
and other structures.