WebDeposit: autocompletion and draft enhancement

• Adds Orcid search for author autocompletion.

• Introduces document type metadata and integrates document type in form rendering.

• Adds Sherpa Romeo search testing class.

• Field icons are rendered from Field.icon_html variable.

• Replaces draft model's integer id with string uuid.

• Refactors new draft, delete draft in order to function with document types.

• JQuery autocomplete functions are rendered if the field has an autocomplete attribute.

• Updates tabcreate.sql with WebDeposit Draft CREATE TABLE script.

• Adds pretty_date function to webdeposit_utils in order to prettify saved drafts list with user friendly timestamp.

• Enhances draft_field_get_all to work also with list of field names.

Reviewed-by: Jiri Kuncar <jiri.kuncar@cern.ch>