Add missing `ENGINE=InnoDB` to the `_field` table.

See merge request !78

#87 required contact id filter throws error for anonymous users

See merge request !77

Fixed issue with filtering on multi value fields (fields which holds multiple values separated by the VALUE SEPARATOR symbol)

Fix for #86 ParseError: syntax error

See merge request !76

#77 Contribution dataprocessor with current user contact filter shows no results

See merge request !75

Contribution fields getting overwritten by contribution soft fields

Add custom link handler referencing two fields.

See merge request !73

Also update original custom link handler to allow customization of link
text as well as URL.