Clean table of figures and captions as TSV

This was generated from the query figures-and-captions.sparql by running the following:
```
blazegraph-runner --journal=treatments.jnl select figures-and-captions.sparql figures-and-captions.tsv
```

.gitattributes

@@ -53,3 +53,4 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.jpg filter=lfs diff=lfs merge=lfs -text
 *.jpeg filter=lfs diff=lfs merge=lfs -text
 *.webp filter=lfs diff=lfs merge=lfs -text
+figures-and-captions.tsv filter=lfs diff=lfs merge=lfs -text

figures-and-captions.sparql

@@ -0,0 +1,41 @@
+PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> 
+PREFIX bibo: <http://purl.org/ontology/bibo/> 
+PREFIX dc: <http://purl.org/dc/elements/1.1/> 
+PREFIX fabio: <http://purl.org/spar/fabio/> 
+PREFIX trt: <http://plazi.org/vocab/treatment#> 
+
+# This query obtains a table of figures with their image URLs and captions.
+# Each figure URI and figure representation URL should be unique in the
+# resulting table.
+# To provide an identifier that lends itself well to uniquely naming files
+# (e.g., the downloaded images) that can easily be back-referenced to this
+# table, an MD5-hash identifier is added as the first column.
+SELECT DISTINCT
+  (MD5(STR(?figure)) AS ?figureID)  # MD5 of figure URI as filename-friendly ID
+  ?figure                           # figure URI
+  (STR(?figureURL) AS ?figURL)      # URL of the figure's representation
+  (STR(?caption) AS ?figureCaption) # textual caption of the figure
+WHERE {
+  ?treatment a trt:Treatment ;      # Taxonomic treatment
+    trt:publishedIn ?pub .          #  published in a publication
+  ?pub fabio:hasPart ?figure .      #  which has a part
+  ?figure a fabio:Figure ;          #  that is a figure
+    dc:description ?caption ;       #       and has a caption
+    fabio:hasRepresentation ?figureURL . #  and a representation at a URL
+  #
+  # Consider only figures that have only one figure representation,
+  # and only one caption.
+  {
+    SELECT ?figure
+    WHERE {
+    	?figure fabio:hasRepresentation ?fUrl .
+	    ?figure dc:description ?fCaption .
+      FILTER (strLen(?fCaption) > 0)
+  	}
+		GROUP BY ?figure
+		HAVING (COUNT(DISTINCT ?fUrl) = 1 && COUNT(DISTINCT ?fCaption) = 1)
+  }
+  # Finally, disregard figures with an empty caption,
+  # and figures that don't seem to be locatable online.
+  FILTER (STRLEN(?caption) > 0 && ! strStarts(STR(?figure), "file:///"))
+}

figures-and-captions.tsv

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:b8d6e804b4a959a50cdcc71a97af7f282ad2ec8bd4321a1e0938f304961030c8
+size 122406336