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Allow WAL record header to be split across pages.
This saves a few bytes of WAL space, but the real motivation is to make itpredictable how much WAL space a record requires, as it no longer dependson whether we need to waste the last few bytes at end of WAL page becausethe header doesn't fit.The total length field of WAL record, xl_tot_len, is moved to the beginningof the WAL record header, so that it is still always found on the first pagewhere a WAL record begins.Bump WAL version number again as this is an incompatible change.1 parent20ba5ca commit061e7ef
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