commit "mboxevent: Rewrite JSON formatting"

[Sébastien Michel]

2012/8/24 Greg Banks <gnb at fastmail.fm>:
>> If nobody else expresses opinion, whether to put xjson in libcyrus or libcyrus_imap, it is up to you.  I just told you my opinion.
>
> My 2c: JSON code is a utility and should go in libcyrus.
>
Indeed.

As discussed on IRC, we decided to change the library to format to
JSON, from libjson (that will support 64bit integer only in the next
release) to jansson that is also a mature library, available on major
Linux distro and already support 64bit.

The last debate is on the bugzilla ticket #3605. It is about removing
the internal xjson.[ch] json formatter and add a default option
--disable-event-notification or --enable-event-notification and force
requirement on jansson library if enabled.
That involves decorating the code with a C macro in all source files
that refer to mboxevent.h.