Update TODO list.

Author: bmomjian

doc/TODO

@@ -1,6 +1,6 @@
 TODO list for PostgreSQL
 ========================
-Last updated:		Sun Jan 28 00:03:41 EST 2001
+Last updated:		Sun Jan 28 10:41:51 EST 2001
 
 Current maintainer:	Bruce Momjian (pgman@candle.pha.pa.us)
 
@@ -331,6 +331,7 @@ SOURCE CODE
 * Merge global and template BKI files (Peter)
 * Fix username/password length limits in all areas
 * Remove compile-time upper limit on number of backends (MAXBACKENDS) (Tom)
+* Make sure all block numbers are unsigned to increase maximum table size
 
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