Fix issue 178: ExecuteReader now returns a wrapper around the command/reader pair, so that the lifetime of the command is extended

Also improve documentation around use of "dynamic" in Query()

Investigate issue 157 (unable to reproduce) - but also found and fixed issue with subsequent query if reader not fully closed down

PostgreSQL syntax error - insert into tcat(breed, name) values(:breed, :name)

An AmbiguousMatchException is encountered when the Type.GetProperty(String, BindingFlags) method is used and there are multiple indexers on the type, so it was replaced with a call to Type.
GetProperty(String, BindingFlags, Binder, Type, Type[], ParameterModifier[]).

Actually, it can work for sprocs without needing SqlClient, as the "structured" bit is inferred and no type-name is required

"TestMultiMappingWithNonReturnedProperty"
Fixed TestSplitWithMissingMembers as a side-effect