Replaced 'import *' and import of variables by import of modules. Some code refactoring/reformatting.
Replaced 'import *' and import of variables by import of modules.
Some code refactoring/reformatting.

inveniosoftware/invenio-formatter,tiborsimko/invenio-formatter,inveniosoftware/invenio-formatter,inveniosoftware/invenio-formatter,tiborsimko/invenio-formatter,tiborsimko/invenio-formatter