Added functions to correct the scores of the categories of a document type, and to enable a category to be moved up or down in score. Also updated functions that manipulate categories to be aware of scores.
Added functions to correct the scores of the categories of a document type, and to enable a category to be moved up or down in score. Also updated functions that manipulate categories to be aware of scores.

tiborsimko/invenio,inveniosoftware/invenio,inveniosoftware/invenio,tiborsimko/invenio