Repoze.catalog

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- Nothing changed yet.

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- Add Travis CI support.

- Drop support for Python 2.6.

- Python 3 compatible

- Add support for Python 3.6 - 3.7
[vangheem, agitator, jensens]

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- Fix bug in query with names are None [ebrehault].

- The 'numdocs' return value from 'Catalog.search' is now a subclass of integer
with an added attribute, 'total', which gives the caller access to the total
size of the result set before being limited by the 'limit' argument.

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- Fix docs rendering.

- Add "dev" and "docs" aliases to setup.cfg.

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- Harmonized index name / discriminator in catalog setup with content schema
and queries used in later examples. Thanks to Douglas Cerna.

- Fixed semantics of 'applyEq' for the Keyword index. The 'applyEq' (and
'applyNotEq') methods now expect scalar values for the query. 'applyAny',
'applyAll' and their respective negations should be used to query multiple
values.

- Fixed bug in query parser where names inside of 'any' or 'all' calls were
not being parsed properly.

- When using CQEs, names may now be embedded inside of a list or tuple,
allowing expressions like this: "tags in any([tag1, tag2])" where tag1 and
tag2 are names that will be resolved at query run time.

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- Deprecated ``.search``-based querying of catalog in favor of newer
query language(s) via ``.query``. See docs for more info.

- Added a ``.docids()`` method to ``CatalogIndex``.

- Deprecated ``repoze.catalog.index.path2.CatalogPathIndex2``.