Remove version-script support to remove additional complexity it introduces (it's not really needed when we hide internal symbols)

Make internal and yparser convenient libraries (noinst_LTLIBRARIES)
and link them only where needed.  Some of the code will get linked
twice into the binary, but that's inevitable unless we want to keep
exporting volatile symbols library to the outside world.

(Or we can cleanup usage of libknot-internal outside libknot and perhaps libknotd.)

Merge libknot-int and libknot-yparser into libknot with versioned symbols to separate main KNOT library and INTERNAL+YPARSER

1. libknot - interfaces has been added (0:0:0 -> 1:0:1)
2. libzscanner - source change, but interface has not (0:1:0)
3. libdnssec - new library (0:0:0)
4. libknot-int - new library (0:0:0)
5. libknot-yparser - new library (0:0:0)

knot1to2: build with daemon, install to libexec

See merge request !377

- Debian: assume current version is Jessie
- Arch, Gentoo: add installation command instead of a link
- FreeBSD: install from root shell, sudo is not in default installation

- Add 'highlight' option to set default syntax on each page
- Add 'code-block' for exceptions

CID 1297156

Temporary fix till we start using a time type with well-defined range.

CID 1269294

Silence the error till the missing feature is re-implemented.

CID 1269291

CID: 1269290