Fixed and made more robust the Dirichlet character test
Merge pull request #171 from nmascot/Fix_Dirichlet_Test

Fixed and made more robust the Dirichlet character test
Fixing import process, moved and improved function for making nice
strings for special number fields, added subfield information for
number fields, updated acknowledgements.
Fix parsing of cyclotomic fields and improving some error messages
Merge pull request #173 from jwj61/master

Fixing import process, moved and improved function for making nice