cut the number of database queries in half for AXFR-in
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Merge pull request #811 from stasic/spellcheck

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enable AM_SILENT_RULES, closing #647
add inline operators for qtype comparison, thanks Mark Zealey. Closes #646
add DS digest type 4 to show-zone output; add algorithm names. Based on a patch by @cmouse, closes #744
Merge pull request #751 from mind04/rectifyaxfr

cut the number of database queries in half for AXFR-in
make goraclebackend "at least work", closes #729
add goracle schema
fix db2 backend includes (#653)
drop unused variables in lua backend (#653)