Change: declaration of serialization parameters

I just committed a small change to align serialization parameters with
the XQuery 3.0 spec: contrary to XQuery 1.0, the 3.0 version of the
language defines a standard way for setting serialization parameters.
The old, non-standard approach in eXist-db was to use a single option
with all parameters in the value:

declare option exist:serialize "method=json media-type=application/json";

The standard way of doing this in XQuery 3.0 would be:

declare namespace output = "http://www.w3.org/2010/xslt-xquery-serialization";
declare option output:method "json";
declare option output:media-type "application/json";

The old approach is still supported for backwards compatibility! The
parameter names remain the same as well.

Wolfgang

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