Resolve namespace issues

[ibboard]

Following the move to schemas and namespaces we've had some problems with XPath and we now appear to have some problems with namespaces on attributes. The XML file loading should be checked and fixed so that all attributes are correctly loaded now that the namespaces are in place.

[ibboard]

(In r78) Re #49 - Resolve namespace issues

• Fix up some XPath queries
• Remove one unnecessary namespace
• Check local name of elements, not name (which is qualified)
• Add method to get double value from an attribute including handling INF
• Remove min/max for equipment item as it is now moved to the UnitType's reference to the equipment item

[ibboard]

r78 also added "nonNegativeOrInfiniteIntegerOrRatio" type to Core schema that allows for units to say "unlimited", "max 5" or "max 33%" for equipment items, but I hit "commit" instead of "cancel".

[ibboard]

All properties seem to be working without namespace issues. Problems of zero-sized units appear to have been because of problems with the ordering of min/max size setting and checks to ensure the minimum size is less than or equal the maximum size.

[ibboard]

Mark released changes as released

[ibboard]

Mark released fixes as released using radio values

[ibboard]

Mark fix as released under a previous version