Concrete

* Added the `summarization` package, which includes the enumeration
`SummarySourceType`, the structs `SummarizationRequest`,
`SummaryConcept`, `Summary`, and `SummarizationCapability`, and the
service `SummarizationService`.
* Added an `id` field to the class `Entity`.
* Added a `rawMentionList` field to the class `Entity`.
* Added an `entity` field to `SearchResultItem`.
* Added `TOPICID` to the `AnnotationTaskType` enumeration

-------------------

- Update to concrete 4.13 schema.

--------------------

- Breaking change: update concrete-inspect.py to support multiple
annotations of the same type. Changes CoNLL output for an annotation
type that is not present: an empty column is no longer printed.

- Refactor concrete.inspect to use annotation filter callbacks to select
annotations rather than tool names, as tool names no longer uniquely
identify an annotation. The new filter_annotations function can be
used to create simple filters; that functionality is exposed in
concrete-inspect.py.

- Add timestamp_to_datetime in concrete.util.metadata

- Add optional gzip compression to CommunicationWriter

- Print situation mention kind and intensity in concrete.inspect

-------------------

- Clean up sphinx doc: suppress thrift_spec fields, render
comments from Thrift verbatim

- Update help for concrete-inspect.py --annotation-headers
(and a few other help messages)

- Add --other-tag option to concrete-inspect.py to enable CoNLL output
of arbitrary token tags

- Move get_tokenizations from concrete.inspect to
concrete.util.tokenization

- Added PropertyLists to situation-mentions output of
concrete-inspect.py

- Fix concrete2json TJSONProtocol UTF-8 bug

-------------------

- Store tweet JSON in Communication.originalText.

- Expand/modify functionality of fetch-client.py:
- Accept communication IDs on standard input
- Write results to tar.gz archive

- Expand functionality of search-client.py:
- Accept search terms as command-line arguments
- Populate SearchQuery.rawQuery field
- Add command-line flags --about, --alive, --capabilities, --corpora

- Add child mentions to "concrete-inspect.py --entities" output.

- concrete.util.simple_comm.create_sentence now sets Token.textSpan field

- CommunicationWriterTar.write() now uses CommID for default filename

- concrete.validate.validate_communication_file() now returns a boolean

- Added script access-http-server.py

- Now using Sphinx to generate documentation

- fetch-client.py can now read Communication IDs from stdin,
and save Communications to a TGZ file

-------------------

- Add brief tutorial to README.rst.

- Switch to zest.releaser for releases.

- Add Python 3 support.