Add --config-name to recursor

This adds --config-name to pdns_recursor and rec_control.
Changed s_programname to recursor as that makes the logic more like pdns_server and is useful.
The rec_control has been updated as well so we can still query the correct recursor
Improved error message for socketfile not found
filling 'ordename' and 'auth'
Fix a typo in the webserver docs
nproxy: Add missing chdir("/") after chroot()

Also make sure that fd 0,1,2 are correctly replaced with /dev/null.
As we (might) chroot() before daemonizing, we must open /dev/null before
chroot-ing.

Reported-By: Morten Stevens
Documentation for include-dir, fixes #967
 fix ringbuffer size decrease
Fix coverity CID 1066169
Merge pull request #971 from cmouse/include-dir-doc

Documentation for include-dir, fixes #967
Merge pull request #951 from cyclops1982/935

Add --config-name to recursor
update pidfile name after b842fd64c37181881a74959add76c5538fd687ea
Merge pull request #952 from mind04/doc

filling 'ordename' and 'auth'
Merge pull request #968 from zeha/docs-typo

Fix a typo in the webserver docs
Merge pull request #970 from zeha/nproxy-chroot-chdir

nproxy: Add missing chdir("/") after chroot()
drop visual studio dsp files, thanks @cmouse
pid file with pdns_ prefix.
Also controlsocket file with pdns_ prefix.
Merge pull request #981 from cyclops1982/935plus

pid file with pdns_ prefix.
add some runtime configurability to the recursor bulktest
allow context override for bulktest xml