values used in queries were added to the keys.csv

Due to a mistake in Tag which added all strings used
by Tag into the String dictionary, the dictionary
did contain all values that were used in queries.

data-store/src/main/java/org/lucares/pdb/datastore/internal/DataStore.java

@@ -175,6 +175,8 @@ public class DataStore implements AutoCloseable {
 		storageBasePath = storageDirectory(dataDirectory);
 
 		Tags.STRING_COMPRESSOR = StringCompressor.create(keyCompressionFile(storageBasePath));
+		Tags.STRING_COMPRESSOR.put(ALL_DOCS_KEY);
+		Tags.STRING_COMPRESSOR.put("");
 		TAG_ALL_DOCS = new Tag(ALL_DOCS_KEY, ""); // Tag(String, String) uses the StringCompressor internally, so it
 													// must be initialized after the string compressor has been created