* Expected file sizes depending on the number of symbols in the sequence are
scattered over the code. There should be a function that computes these sizes
given the number of symbols, the integer size, and a fid_TABLE_* constant.

* Documention should mention how to build universal binaries on Mac OS X. Since
suffix arrays are byte-order-dependent, configuring with "-arch i386 -arch ppc"
in CFLAGS and LDFLAGS is not good enough. The user _must_ configure on x86 and
PPC separately, and use lipo to create a Mach-O fat binary. Building universal
binaries directly succeeds, but the result will not work on PPC if built on x86
(and the other way around). A configure check might be useful to prevent the
user from a broken binary.
