Add enum class in namespace to Root

[pcanal]

@Viesturs

WorkEnum_tDict_rdict.pcm is placed in the lib directory of the external directory.

Error in <TCling::RegisterModule>: cannot find dictionary module WorkEnum_tDict_rdict.pcm

This is strange. Can you try to add the directory that contains the library and the pcm file to the LD_LIBRARY_PATH shell environment variable?

Note; not finding this file might explain the error messages about not knowing the namespace.