Merge pull request #259 from wolfgangmm/develop

Small fixes to new range and lucene indexes
[extension] - update betterform 5.0rc8
Merge pull request #260 from zwobit/develop

[extension] - update betterform 5.0rc8
Prevent NPE as reported in https://github.com/eXist-db/exist/issues/254
Smaller code improvements
Merge pull request #261 from dizzzz/community_support

Improve SQL extension