Taxonomy vocabularies are locked by default everywhere

[idimopoulos]

It seems that taxonomy vocabularies created though the UI are locked by default. The UI does not offer any option to change the value and the result is that the user cannot add any terms to the vocabulary, rendering the functionality a bit useless.

Further more, this locked mechanism is used all over the place including the rdf_taxonomy_taxonomy_vocabulary_access and rdf_taxonomy_taxonomy_term_access which are referring to the overview page.
There, the locked mechanism is checking whether the user has the view access or the vocabulary is locked. However, a locked vocabulary should not refer to the ability to view the tree. The user should not be able to add/edit/delete/reorder terms but he should be able to view them.

[idimopoulos]

Related issues #61

[idimopoulos]

This also affects the automatic creation of terms in forms badly, where the entity reference field is set to be able to do so.