admin: metadatum / terms of metakeys

delivers [#62565044]

Squashed commit of the following:

commit 27bf1a41976d4a77988717148b57292180cbadb7
Author: Michał Podlecki <m.podlecki@op.pl>
Date:   Wed May 28 15:49:04 2014 +0200

    update personas db dump

commit 1137e1d4a0230486eb54bb2bfe0cef4d731d72aa
Author: Michał Podlecki <m.podlecki@op.pl>
Date:   Mon May 19 10:31:39 2014 +0200

    Squashed commits:

    meta terms sorting adjustments; alphabetical order flag

    display meta terms list as closed list if there is more than 16 of them
admin: Improvement metacontexts and metacontext groups

delivers [#72166730]

Squashed commits:

admin can add meta keys to meta context

admin can remove a context from a context group

admin can delete a context

admin can delete meta key from a context

resolve depreciation warnings

fix meta context delete from meta conntext group

run tests for admin_meta_contexts
ui: context/vocabulary revamp #1

- combine old UI of context, vocabulary and abstract into 'vocabulary' tab
- rename all instances of 'context' to vocabulary
- re-implement term-usage filter-slider
- retired parts of the old internal API (abstract etc)