some more changes in checklist editor

ref #7268 Fix merge problem

ref #7268 Implement own extension point for preferences

Conflicts:¶

eu.etaxonomy.taxeditor.workbench/fragment.e4xmi¶

ref #6925 Implement utility method to open links in external browser

Merge branch 'release/4.14.0' into develop

Updated version in pom / project files to taxeditor version : 4.15.0-SNAPSHOT and cdmlib version : 4.15.0-SNAPSHOT

Updated version in pom / project files to taxeditor version : 4.14.0 and cdmlib version : 4.14.0

csv print also should use monitored operation

Rename class to avoid duplicate class names

Fix potential NPE