Sphinx-needs

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* Improvement: :ref:`need_part` has now attributes `id_parent` and `id_complete`, which can be referenced
in :ref:`filter_string`.
* Improvement: :ref:`needtable` supports presentation of filtered :ref:`need_part` (without showing parent need).

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* Improvement: :ref:`filter_string` now supports the filtering of :ref:`need_part`.
* Improvement: The ID of a need is now printed as link, which can easily be used for sharing. (:issue:`75`)
* Bugfix: Filter functionality in different directives are now using the same internal filter function.
* Bugfix: Reused IDs for a :ref:`need_part` are now detected and a warning gets printed. (:issue:`74`)

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* Improvement: Added needtable option :ref:`needtable_show_parts`.
* Improvement: Added configuration option :ref:`needs_part_prefix`.
* Improvement: Added docname to output file of builder :ref:`needs_builder`
* Bugfix: Added missing needs_import template to MANIFEST.ini.

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* Bugfix: A :ref:`need_part` without a given ID gets a random id based on its content now.
* Bugfix: Calculation of outgoing links does not crash, if need_parts are involved.

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* Bugfix: Need representation in PDFs were broken (e.g. all meta data on one line).

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* Bugfix: Latex and Latexpdf are working again.