anchor.diff:  The following release notes allow following BCD-UI's updates and to judge whether migrating to a newer version is worth it.
   Some changes are not backward compatible and may require code change in the project. They are listed here as well.
   
  -==== Release 5_5_0 ...in progress
  +==== Release 5_6_0 ...in progress
  +
  +.Major new features:
  +*
  +
  +Incompatibilities:
  +
  +** Move shiro settings from web.xml to WEB-INF/shiro.ini, add <listener><listener-class>org.apache.shiro.web.env.EnvironmentLoaderListener</listener-class></listener> before shiro filter, update shiro filter from org.apache.shiro.web.servlet.IniShiroFilter to org.apache.shiro.web.servlet.ShiroFilter
  +** Drop is_server column from bcd_virtualFileSystem
  +** WrqModifier process() does not any more return a fragment in some cases but do now always work on the input document
  +** bnd:Coalesce in Binding files was removed
  +** getTableName() was renamed to getTableReference()
  +and needs also to be updated sql expression strings compiled with SQLEngine::transform()  "... $k.getTableName()..." -> $k.getTableReference() or simply $k
  +
  +==== Release 5_5_0
   
   .Major new features:
   * Migrated BCD-UI to Java 11
  
positive.code: 
  * Config
  ** In web.xml: add invalidRequest.blockSemicolon = false and check for other changes in Server/configFiles/web.xml
  ** move shiro settings to WEB-INF/shiro.ini, add <listener><listener-class>org.apache.shiro.web.env.EnvironmentLoaderListener</listener-class></listener> before BcdUiApplicationContextListener, update shiro filter from org.apache.shiro.web.servlet.IniShiroFilter to org.apache.shiro.web.servlet.ShiroFilter
  ** Ensure to update dependency jars, see Docu/development/bcdui_dependencies.gradle
  ** Use Server/configFiles/log4j2.xml (instead of log4j.properties)
  ** Wrq2SqlServlet has restricted access permissions now requiring bcdAdmin:ImplementationDetails as it reveals implementation details (actual names of db objects)
  ** bindingItem skipWriteCheck attribute (to bypass subject settings write checks) was removed. Use the new mode (R|W|RW) attribute on SubjectFilterType instead
  ** for new themes, guiStatus:bcdSideBarPin was changed to guiStatus:bcdSideBarPin-left and guiStatus:bcdSideBarPin-right in case you preset a collapsed/expanded sidebar
  ** remove is_server from bcd_virtualFileSystem
  
  .All versions of 3rd party libraries for runtime, are listed in
  * bcdui_dependencies.gradle for java
  
negative.code: ** allow button actions to be triggered via bcdGrid:save, bcdGrid:reset, bcdGrid:addRow on targetHtml
  ** major improvement to grouped headers
  ** fixed columnFilter for empty values
  ** bcduiInputField editor follows handsontable's grid cell movement rules, closes correctly on identical values
  
  * DocUploader
  ** initial commit of a document uploader component, uses VFS (bcd_docUpload binding) to store data on scope/instance level (scope subjectsettings)
  