guile-xapian 0.6.0

# NEWS

guile-xapian now requires swig>=4.2 and xapian>=2. The high-level
interface in `(xapian xapian)` remains unchanged. But, the low-level
wrapped functions in `(xapian wrap)` may have changed. Please see
https://getting-started-with-xapian.readthedocs.io/en/latest/deprecation/upgrading.html
for the changes to the Xapian C++ API.
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