new mail:get-messages function
Merge pull request #321 from gspringtech/develop

new mail:get-messages function
[bugfix] map type returned number of keys as sequence length. This is wrong. A map is a single item and should thus return a sequence length of 1.
Merge branch 'develop' of https://github.com/eXist-db/exist into develop
Merge pull request #331 from wolfgangmm/develop

Maps: wrong sequence length returned by map type
[ignore] Fix installer: skip range index data directory; include required xqjson to installed packages
Merge branch 'develop' of https://github.com/wolfgangmm/exist into develop
Merge pull request #332 from wolfgangmm/develop

Small update to installer