[MOD] Options: hard-coded option strings replaced with Option instances
[MIN] Options: comments
[MIN] Options: cleanup
[ADD] Serialization of XQuery maps to JSON.
      Example. serialize({ "A":"B" }, { 'format' : 'map' })
[ADD] JSON: Serialization of XQuery maps to JSON
[MOD] GUI: export dialog revised
[MOD] Move `StaticContext` out of the `QueryContext`.
[FIX] `fn:error(...)` calls inserted by the compiler now have the correct type.
[MOD] Enable inlining of small functions.
[MOD] Some optimizations for inlining.