[bugfix] Query optimizer did not descend into „update …“ expressions.
[bugfix] Nodes were removed from indexes multiple times when using node-level update expressions.
[ignore] Increase allowed-fragmentation parameter: default was much too low, causing delays during updates.
[performance] Drop redundant reindex operations in „update insert“. Should definitely increase update performance.
[testsuite] Separate node-level update tests for new range index.
Merge branch 'develop' of https://github.com/eXist-db/exist into develop
Merge pull request #134 from wolfgangmm/develop

Fix for XQuery Update/XUpdate performance issues