RDATA lowercase: Converting in packet parsing + zone load.
Converting to lowercase when saving to zone proved insufficient, because case-insensitive comparison of RDATA would be needed in some scenarios - e.g. in IXFR (SOA replacement) and DDNS processing. Moved the conversion to packet parsing - all dnames in RDATA are converted to lowercase when parsed from wire. RDATA parsed from zone file are converted there (in scanner_process()). Later the conversion may be moved to a lower level of parsing (and with some option to turn it on/off). QNAME is unaffected by this change.
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