- knot_ prefix dropped
- flags cleanup
- node.h functions reorganized
- also fixed a few comments/formattings that had nothing to do with node structure

clarity.

The support for this option can disable checking for Ragel forcibly,
thus enforcing the usage of precompiled scanner.c.

clang 3.4 brings some fresh air

impl.

Use binary comparison instead of string comparison for the received MAC.

The transaction signature was checked only partially, if the MAC
contained a zero byte. If this was the very first byte of the signature,
the checking didn't happen at all. In addition, possible ASCII
characters in the MAC were compared case insensitively.

No reasoning behind this change, except that it seems to work more
reliably. On my machine getfqdn() returns 'localhost.localdomain',
while Knot detects correct system canonical name. On distel, both
functions return the same result.

fixes #226

Conflicts:
	src/knot/zone/semantic-check.c

close #216

Conflicts:
	src/knot/zone/node.c
	src/knot/zone/node.h
	src/knot/zone/zone-contents.c
	src/knot/zone/zone-contents.h