EDIT

introducing the api hook cdm_feature_node_blocks_alter and removing hook_cdm_feature_node_blocks_alter, this makes theme_cdm_feature_nodes obsolte, reducing speccial code in palmweb theme

more flexible table of content creation, hook_cdm_feature_node_toc_items_alter() no longer needed

hiding empty feature blocks

hiding all footnote keys in palmweb portal

fixing the feature block layout, footnotes and bibliography for palmweb, solving #4379 (Citations only consist of footnotes if bibliography block is enabled)

additional test

fixing bug in plamweb, and renaming sort mode constant

fixing #1933 (DescriptionElementBases do not show annotation footnotes in flora malesiana portal)

removing replaced theme function

refactoring theme_cdm_descriptionElementTextData() #3484 , mock implementation of feature block settings #3257, solves most issues of #3915 (handling of annotations and sources inconsistent in theme_cdm_descriptionElementTextData)