pgsql: Remove: < * Add a GUC to control whether BEGIN inside a

Log Message:
-----------
Remove:

< * Add a GUC to control whether BEGIN inside a transcation should abort
< the transaction.

Modified Files:
--------------
pgsql/doc:
TODO (r1.2021 -> r1.2022)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/TODO.diff?r1=1.2021&amp;r2=1.2022)
pgsql/doc/src/FAQ:
TODO.html (r1.523 -> r1.524)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/FAQ/TODO.html.diff?r1=1.523&amp;r2=1.524)