[honey] Improve spelling table key encoding
commit6d1c383f494da895710050482db6672f01ae4928
authorOlly Betts <olly@survex.com>
Sun, 11 Mar 2018 22:33:03 +0000 (12 11:33 +1300)
committerOlly Betts <olly@survex.com>
Mon, 12 Mar 2018 01:21:41 +0000 (12 14:21 +1300)
tree64a330a3a765c2526f0ba79b24defe95423d0515
parenteaf3400eda0e157f5a2890e81cd4a24bbeadf2ee
[honey] Improve spelling table key encoding

In real-world use, word frequency keys are now a byte shorter and
benefit from the array index lookup.
xapian-core/backends/honey/honey_compact.cc
xapian-core/backends/honey/honey_spelling.cc
xapian-core/backends/honey/honey_spelling.h
xapian-core/backends/honey/honey_spellingwordslist.cc
xapian-core/backends/honey/honey_spellingwordslist.h
xapian-core/backends/honey/honey_version.cc