finished: search within span.
new Method getAnnotationValues in SpanBox ... used to
fill ComboBox cbSpanValue with values or to update those
values

next step: include metadata
changed some comments
added method: getAnnotationValues
finished search within span
next step is including metadata
added method:
getMetaDatum (which key is modified?)
getValues (returns Collection of values)
meta query nearly complete ... some issues remaining with AQL
regex characters are now escaped in aql query (metaquery)
EdgeBox contains natural language
value ".1" changed to ".2"
disjunct meta values are put in brackets
disjunct meta values are put in brackets