add default for empty value to asNum(), and use a value of 1 for all thread settings in auth
upgrade notes, module-dir location switched form LIBDIR to PKGLIBDIR
don't add superfluous nsec3 for old bind
allow building of gpgsql/lua/mydnsbackend, plus yahttp, when boost is in a non-standard location. Fixes #1521
allow building of db2/goracle/ldap/opendbx/oracle backends (untested) plus tinydnsbackend (tested), when boost is in a non-standard location
Merge pull request #1518 from mind04/receiver-threads

add default for empty value to asNum(), and use a value of 1 for all thr...
Merge pull request #1525 from mind04/libdir

upgrade notes, module-dir location switched form LIBDIR to PKGLIBDIR
Merge pull request #1526 from mind04/no-flu

don't add superfluous nsec3 for old bind