DNSSEC: handle KSK and ZSK independenlty, do not sign DNSKEY with ZSK
DNSSEC: allow Single-Type Signing Scheme
tests-extra: dnssec-verify, ignore KSK flag setting
tests-extra: DNSSEC Single-Type Signing Schema
tests-extra: consider single-type signing in dnskey_algorithms
DNSSEC: single-type signing documentation
Merge branch 'dnssec-single-type-signing' into 'master'

DNSSEC: Single-Type Signing

See merge request !312
rrset-dump: add key length to DNSKEY comment
rrset-dump: add comments to dnskey_len switch cases
Merge branch 'dnskey_keylen' into 'master'

See merge request !313
tests: added journal/refill after flushing + size check

refs #309
unittests: Test for lookup table and serial_compare

TODO: Handle the undefined corner cases of serial difference.
TODO: NULL arguments to lookup table?
unittests: Finished utils test +lookup table fixed

lookup table: checking parameters
serial compare: legal corner cases proper testing
                (Maybe they should be ommited, because it would
                also be legal if the comparisons had opposite
                results. But at least we will know if we change
                something.)
Update project files
Remove extra line at the end of the file