Update pdns.xml

Small update to docs, spotted by sid3windr
Merge pull request #925 from cyclops1982/patch-1

Update pdns.xml
just fill out domains
update documentation about our pdns-tools
output warning message when no to be notified NS's are found

fixes #926
Merge pull request #928 from cyclops1982/926

output warning message when no to be notified NS's are found
nit
Fix a typo in error message
Update gpgsql queries

fixes #927
silence dead code warning in version.cc
improve += options
change zone backup during tests to zone restore
remove unused files
sdig flags
answer direct NSEC queries without DO bit
Merge pull request #932 from cyclops1982/927

Update gpgsql queries
Merge pull request #931 from rubenk/master

Fix a typo in error message
Merge pull request #933 from mind04/denitify

a little bit of everything