libknot: Merge algorithm sources

Knot.files

src/Makefile.am

src/libknot/consts.c

src/libknot/consts.h

src/libknot/dnssec/algorithm.c

src/libknot/dnssec/algorithm.h

src/libknot/dnssec/nsec3.c

src/libknot/dnssec/nsec3.h

src/libknot/dnssec/sign.c

src/libknot/dnssec/sign.h

src/libknot/dnssec/zone-keys.c

src/libknot/rrset-dump.c

tests/dnssec_nsec3.c