Tests + <AmdmntInfDtls> removed for now

[ADD] Added the tests for <AmdmntInd>
[TEST] The tests pass for the recently added <UltmtCdtr> tag that’s
optional
[FIX] <AmdmntIndDtls> is actually <AmdmntInfDtls>
[DELETE] For now <AmdmntInfDtls> it is not added - multiple child nodes
must be added, so I just commented what I’ve done so far and added a
TODO note.