drop no-op flag strict-rfc-axfrs, thanks Jelte
also drop strict-rfc-axfrs from pdns.conf-dist
activate MINFO, thanks Jelte
add MINFO to qtypes
report TXT only once, thanks @zeha
Reverted TSIG changes
Merge pull request #864 from cmouse/tsig-revert

Reverted TSIG changes
Applying updates mentioned in ticket #617

The documentation should be RFC2606, RFC3849 and RFC5737 compliant. And added documentation regarding the gmysql-password= option in pdns.conf.
Include a warning in the supermaster section

Some users coming to #powerdns ask questions and don't see the SOA isn't available on the slave as long as they don't run pdnssec rectify after a change.
Merge pull request #869 from nlmark/patch-2

Include a warning in the supermaster section
Merge pull request #867 from nlmark/patch-1

Applying updates mentioned in ticket #617
sql constraint clarification, thanks Markus Petzsch