guile-xapian 0.5.0

# NEWS

This may be the last release to support xapian 1.x.x.

## New dependencies

guile-xapian now requires [run64](https://forge.systemreboot.net/run64/) to run tests.

## Features

### New query combinators `query-xor` and `query-phrase`
### `parse-query` supports partial matching
### `parse-query` supports pure NOT queries
### `parse-query` allows specifying the default operator
### Query combinators produce composite queries with more than two subqueries
For example, `(query-or (query "foo") (query "bar") (query "foobar"))` now produces `foo OR bar OR foobar` rather than `foo OR (bar OR foobar)`. In most circumstances, this is primarily a cosmetic difference.
### New getters `term-string`, `term-wdf`, `term-freq`, `term-positionlist`, `position-termpos`, `document-termlist` and `query-termlist`
### New `fold`-style functions `positionlist-fold` and `termlist-fold`
### Great big smoke test ported over from python bindings
Not a new feature per se, but yay for robustness!

## Noteworthy bug fixes

### Query combinators preserve order of subqueries
This is important for query combinators such as `query-filter`.
### Handle `#t` `repeated?` and `prefer-mdy?` in `prefixed-date-range-processor` and `suffixed-date-range-processor` correctly
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