Allow entry & lookup of partial namespaces as well as single unit names.

[delphidabbler]

Finding Defaults yields System.Generics.Defaults but finding Generics.Defaults returns an error. It would bve good if this worked too.

[delphidabbler]

It would also be useful if entering Generics.* also yielded useful results: e.g. System.Generics.Defaults & System.Generics.Collections.

Much harder to implement though.