Typo causes SSP parser to ignore "Connector" elements

[kyllingstad]

In ssp_parser::ssp_parser(), the element name ssd:Connector is spelled with a double colon, ssd::Connector. This causes the parser to ignore such elements.

If it is corrected, the tests fail because the parser looks for a type attribute in the Connector element, which doesn't exist. It should look at the type-specific subelement instead (e.g. <Real>).