Bug 719475 - [IMAPx] Increase multi-fetch chunk size to 32KB

This speeds-up message download significantly. The previous value
was around 2.5KB, which meant hundreds of requests for multi-mega-byte
messages.
Bug 730788 - [IMAPx] Deadlock during IDLE start
Bug 730645 - Search / filtering for "has words" is broken
Bug 729850 - CamelMimeParser cannot parse mbox files

This is a revert of commit f44a3d2a547f9a76d68bc63bb13eaaf165455400,
the GUnixInputStream is not seekable, not talking about portability
issues when using Unix-specific structures.
Bug 730979 - [IMAPx] Quota information is not read properly

This is regression after a fix for bug #722275.
Updated Czech translation
Updated Italian 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.