Merge pull request #541 from ontohub/534-fix_alternative_iri_varchar_issue

switch iri column of AlternativeIri to text
Better description of repository cloning methods in view.
Merge pull request #542 from ontohub/536-explain_clone_with_ssh_git

Better description of repository cloning methods in view. Fixes #536.
Merge branch 'staging' into develop
Merge branch 'develop' into develop.ontohub.org