initial stab at 'ALIAS' or 'ANAME' records for PowerDNS. To use, set an ALIAS record on your apex. Secondly, configure PowerDNS with 'recursor=a.recursor.ip'. Sample zone:

@	IN	SOA	ns1 ahu 2014091619 7200 3600 1209600 3600
@	IN	NS	ns1
@	IN	NS	ns2
www	IN	CNAME	xs.powerdns.com.
ns1	IN	A	1.2.3.4
ns2	IN	A	4.3.2.1
@	IN	ALIAS	www.powerdns.com.
@	IN	MX	25 outpost.ds9a.nl.
elsewhere	IN	CNAME	@

Semantics are that real records override the ALIAS. We only reach out to the alias record if nothing else matched.
this currently breaks ANY queries for the apex btw.
some documentation
remove spurious 'any' (thanks seth) plus clarify CNAME walking
typos
EDNS0, AXFR details, rationale, some wording improvements
raise log level on dlerror(), fixes #1734, thanks @James-TR
use kernel recorded arrival time for question/answer latency measurements, so we include the queue of packets waiting for userland attention in our stats. could be bad.
Update Makefile.am

Install man1/disdist.1 when building tools
Make sure yahttp is linked into remotebackend

Make sure that the yahttp directory is built first
and then link in the resulting library.

Checked with readelf -s .libs/libremotebackend.so | grep NOTYPE
that this fixes the undefined symbol.

Fixes #1732
Mydnsbackend depends on smysql from gymsqlbackend

Fixes #1738
Bail out if geoip and yaml libs are not installed
Detect cdb on OSX

cdb from homebrew doesn't ship a .pc file
so detect it the old-fashioned way.
Merge pull request #1736 from RvdE/patch-4

Update Makefile.am
Merge pull request #1742 from rubenk/detect-cdb-on-osx

Detect cdb on OSX
also dist dnsdist.1
Merge pull request #1739 from rubenk/link-yahttp-into-remotebackend

Make sure yahttp is linked into remotebackend
Merge pull request #1740 from rubenk/fix-mydnsbackend

Mydnsbackend depends on smysql from gymsqlbackend
Merge pull request #1741 from rubenk/check-geoip

Bail out if geoip and yaml libs are not installed
put dnsdist.1 in rpm
aj noted that our docs describe how recursor statistics add up badly, fixed