#48 Ignore MDSCHEMA_MEASURES where IS_MEMBER_VISIBLE is false

[Julian Hyde]

As of mondrian change 10906 (mondrian 3.0.2 approximately), mondrian's XMLA server responds to the MDSCHEMA_MEASURES call with hidden measures with the IS_MEASURE_VISIBLE attribute set to false. Previously it didn't return these members.

JPivot's XMLA connector should check that attribute and ignore such members. Mainly applies to calculated measures, and in particular populating the tree of measures in OLAP Navigator.