+added support for numbers in data labels

DataInstanceUse returns DataInstanceUse:

	dataInstance=[DataInstance|EString]

	dataInstance=[DataInstance|NumberAsIdentifier] | 

	(  dataInstance=[DataInstance|EString]

	   ('(' argument+=ParameterBinding ( "," argument+=ParameterBinding)* ')' )?

	   ('.' reduction+=MemberReference)*

	)

	//TODO: if for some reason the data instance use does have a name

	//it will cause problems... same applies for other scenarios 

	//TODO: create a more elegant way to handle that gracefully)

	//(name=EString)?

	;

NumberAsIdentifier returns ecore::EString:

    '-'? INT ('.' INT)?;

MemberReference returns MemberReference:

	member=[Member|EString]

;