[QuickStatements] Allow multiple statements within one reference snak

[Former user]

Example:

Q4115189 P231 "100-00-5" S248 Q20022913 S854 "http://www.cdc.gov/niosh/npg/npgd452.html"

registers as two difference sources for that statement. What I want is a way for those two reference statements to count toward the same reference, since both properties describe the same source being used.

[Laddo]

Indeed, the Properties following a Snnn "source" statement should be appended to the same source entry, not be handled as new qualifiers on that statement