than isc_mem_t * to provide a general mechanism to pass context to
the call back. dns_load_master() has an additional arguement to
support this. to get the old behaviour set the arguement, private,
to the same value as mctx.
Add master file reader, master.c master.h, incomplete.
gen.c was not generate correct include file, SWITCHXXX macros were
being terminated early if last RR type was class specific.
Added base64 support to rdata.c.