Fix a bug in CTSTestCase.
The ulp of the complex numbers o1 and o2 were not compared.
Correct some errors in the Javadoc.
Fix two bugs in GeodeticDatum and clean a few other classes.

First, the Map datums was not filled during the construction of a GeodeticDatum.

Second, the the the use of a the class Identifier as a key threw NullPointerException during the test,
so I choose to pass to String as in VerticalDatum.
Implementation of tests for org.cts.datum.GeodeticDatum.
Merge branch 'fixBugs' into GeodaticDatumTest
Correct the author name in test org.cts.datum.GeodeticDatumTest.
Improve the uses of appends in Ellipsoid class.
Modification of the code so that the Map datums from org.cts.datum.GeodeticDatum uses Identifier instead of String as a Key.
Fix a bug that prevent the merging.
A new fix for the conflicts in merging.
Merge pull request #12 from jparty/GeodaticDatumTest

Geodatic datum test