fix null pointer derferences;
clean up dorade code.
Merge remote-tracking branch 'origin/4.5.2' into 4.5.2
fix unit tests
fix covarity defects
Added more examples and tests from the CF doc.
Merge branch '4.5.2' of https://github.com/Unidata/thredds into 4.5.2
Added the remaining examples from the CF Conventions doc.
* Added code to convert the NcML examples to NetCDF-3.