change relevant fields to text or big varchar

Change relevant fields (i.e. name) to text or a big
character varying limit (i.e. 4096 for paths), for
the following tables:

  - entities
  - categories
  - formalitylevels
  - licensemodels
  - links
  - logics
  - languages
  - metadata
  - ontologies
  - ontology_types
  - ontology versions
  - oops responses
  - projects
  - repositories
  - resources
  - sentences
  - serializations
  - tasks
  - teams
  - tools
  - url maps
  - users

As requested these changes are applied into one massive
migration. This also includes the necessary adjustments
to model-column based tests.
Merge pull request #811 from ontohub/534-adjust_possible_overlength_text_fields

534 adjust possible overlength text fields