Products-zcatalog

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- Fix BooleanIndex when index inversion occurs as a result of reindexing
and existing document with the opposite value. Fixes LP 1236354.

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- Strip white space from name when adding a column or index.

- Forward compatibility for Zope 4 removal of RequestContainer.

- Optimize brain instantiation, by creating underlying record items in a
single step, instead of creation and three update calls.

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- LP 727981: Fix DateIndex ZMI browsing for dates in the first month of a
year.

- Unify Unindex and DateIndex search logic (`_apply_index`) adding `not`
support to DateIndexes.

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- Fixed another issue with preserving score values, when a custom index was
queried first which was neither ILimitedResultIndex aware nor return scores,
and a later index was of the default ZCTextIndex type.

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- Expand query report, to cover details on sort indexes, order and limits.

- As part of each progress handler report, also do an automatic transaction
savepoint, to give the ZODB cache a chance to do garbage collection.

- Added a `threshold` argument to the catalog's `addColumn` and `delColumn`
methods and used it for a progress handler. Also optimized some of their
internals.

- Added support for `sort_on` queries with any number of sort indexes and
differing `sort_order` values. For example:
`{'foo': 'a', 'sort_on': ('foo', 'bar')}`
`{'foo': 'a', 'sort_on': ('foo', 'bar'), 'sort_order': ('', 'reverse')}`
`{'foo': 'a', 'sort_on': ('foo', 'bar', 'baz')}`

- Added support for `not` queries in field and keyword indexes. Both
restrictions of normal queries and range queries are supported, as well as
purely exclusive queries. For example:
`{'foo': {'query': ['a', 'ab'], 'not': 'a'}}`
`{'foo': {'query': 'a', 'range': 'min', 'not': ['a', 'e', 'f']}}`
`{'foo': {'not': ['a', 'b']}}`.
Note that negative filtering on an index still restricts items to those
having a value in the index. So with 10 documents, 5 of them in the `foo`
index with a value of `1`, a query for `not 1` will return no items instead
of the 5 items without a value. You need to index a dummy/default value if
you want to consider all items for a particular index.

- Updated deprecation warnings to point to Zope 4 instead of 2.14.

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- Added a new `load_from_path` class method to the `PriorityMap`, which allows
one to load a plan from a file, instead of a module via an environment var.