in preparation for splitting up rbtdb.c, rename some types so they
can be defined in dns/types.h instead of only locally. these include:
- struct noqname, which is used to hold no-qname and closest-encloser
proofs, and is now named dns_proof_t;
- rbtdb_rdatatype_t, which is used to hold a pair of rdatatypes and
is now called dns_typepair_t and defined in rdatatype.h;
- rbtdb_serial_t, which is now just a uint32_t;
- rdatasetheader_t and rdatasetheaderlist_t, now called
dns_slabheader_t and dns_slabheaderlist_t;
- rbtdb_version_t, now called dns_rbtdb_version_t.
the helper functions header_from_raw() and raw_from_header() are
renamed dns_slabheader_fromrdataset() and dns_slabheader_raw().
also made further style changes:
- fixing uninitialized pointer variables throughout rbtdb.c;
- switching some initializations to struct literals;
- renaming some functions and struct members more descriptively;
- replacing dns_db_secure_t with a simple bool since it no longer needs
to be tri-valued.
Evan HuntandOndřej Surý
1c21e50953