improve code snippets for Dirichlet character
add test file for characters
replace print statements by logger.debug calls
characters pass all 9 tests
delete obsolete file DirichletCharacter
add small tests for Hecke code
Merge branch 'master' into hecke-grossenchars
Hecke presentation, fake things inside
new labeling scheme for ideals
labeling of number field ideals
add -broken- conductor generator