Merge branch 'dev' into f-json-converter

unittests/broken_cfoods/broken1.yml

+Definitions:
+  type: Definitions
+  #include "description.yml"
+
+# Converter-Provenance
+# DataAnalysis/project_dir/measurement/match/identifier
+# Structure-Element-Provenance
+# DataAnalysis/2020_SpeedOflight/2020-11-10_kram
+
+DataAnalysis:  # name of the converter
+  type: Directory_djskfj
+  match: DataAnalysis
+  subtree: &template
+    project_dir:  # name of the first subtree element which is a converter
+      type: Directory
+      match: (?P<date>.*?)_(?P<identifier>.*)
+      records:
+        Project:  # this is an identifiable in this case
+          parents:
+          - Project  # not needed as the name is equivalent
+          date: $date
+          identifier: $identifier
+  
+      subtree:
+        measurement:  # new name for folders on the 3rd level
+          type: Directory
+          match: (?P<date>[0-9]{4,4}-[0-9]{2,2}-[0-9]{2,2})(_(?P<identifier>.*))?
+          records:
+            Measurement:
+              date: $date
+              identifier: $identifier
+              project: $Project
+          subtree:
+            README:
+              type: MarkdownFile  # this is a subclass of converter File
+              # function signature: GeneralStore, StructureElement
+              # preprocessors: custom.caosdb.convert_values
+              match: ^README\.md$
+              # how to make match case insensitive?
+              subtree:
+                description:
+                  type: DictTextElement
+                  match_value: (?P<description>.*)
+                  match_name: description
+                  records:
+                    Measurement:
+                      description: $description
+                responsible_single:
+                    type: DictTextElement
+                    match_name: responsible
+                    match_value: &person_regexp ((?P<first_name>.+) )?(?P<last_name>.+)
+                    records: &responsible_records
+                      Person: 
+                        first_name: $first_name
+                        last_name: $last_name
+                      Measurement:  # this uses the reference to the above defined record
+                        responsible: +$Person    # each record also implicitely creates a variable
+                                                 # with the same name. The "+" indicates, that
+                                                 # this will become a list entry in list property
+                                                 # "responsible" belonging to Measurement.
+
+                responsible_list:
+                  type: DictListElement
+                  match_name: responsible
+                  subtree:
+                    Person:
+                      type: TextElement
+                      match: *person_regexp
+                      records: *responsible_records
+
+ExperimentalData:  # name of the converter
+  type: Directory
+  match: ExperimentalData
+  subtree: *template
+
+SimulationData:  # name of the converter
+  type: Directory
+  match: SimulationData
+  subtree: *template