Reorder items and mark some as completed.

> * Allow savepoints / nested transactions [transactions] (Bruce)
215d210
< 	o Add GUC parameter to control the maximum number of rewrite cycles
227,228c222
< 	o Allow parameters to be specified by name and type during
< 	  definition
> 	o Allow parameters to be specified by name and type during definition
304,305d297
< * Overhaul bufmgr/lockmgr/transaction manager
< * Allow savepoints / nested transactions [transactions] (Bruce)
386,387c378,379
< * Add checkpoint_min_warning postgresql.conf option to warn about checkpoints
<   that are too frequent
> * -Add checkpoint_min_warning postgresql.conf option to warn about checkpoints
>   that are too frequent (Bruce)
390d381
< * Allow pg_xlog to be moved without symlinks
406c397
< * Precompile SQL functions to avoid overhead (Neil)
> * -Precompile SQL functions to avoid overhead (Neil)