tables > 1 gig

Config.h has this. Does this need to be updated because we can't vacuum
multi-segment relations? I have changed it to 7F000000:

/*
* RELSEG_SIZE is the maximum number of blocks allowed in one disk file.
* Thus, the maximum size of a single file is RELSEG_SIZE * BLCKSZ;
* relations bigger than that are divided into multiple files.
*
* CAUTION: RELSEG_SIZE * BLCKSZ must be less than your OS' limit on file
* size. This is typically 2Gb or 4Gb in a 32-bit operating system. By
* default, we make the limit 1Gb to avoid any possible integer-overflow
* problems within the OS. A limit smaller than necessary only means we
* divide a large relation into more chunks than necessary, so it seems
* best to err in the direction of a small limit. (Besides, a power-of-2
* value saves a few cycles in md.c.)
*
* CAUTION: you had best do an initdb if you change either BLCKSZ or
* RELSEG_SIZE.
*/
#define RELSEG_SIZE (0x40000000 / BLCKSZ)

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