Resolve "missing link between DataObject and its underlyingType"

added 9 commits

bbc729f7 - WIP on this branch
5b2d3972 - let getNsIdentification() be public to be called by everyone
20766943 - use getNsIdentification() for messages in buildExplicitLinks()
01b9f380 - call buildExplicitLinks() on ServiceNS files and correct resulting NPE
86dee76f - redo namespace equivalence
54c4accb - add explicit links for underlying type
3fd25cbc - avoid multiple calls on same object to builsExplicitLinks()
7a03b042 - rework links between NS
c1db887d - build explicit links before applying ServiceNSUsage

unmarked as a Work In Progress

mentioned in commit bcdbd021

merged

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