Log Message:
-----------
Fixed an important bug about NULL handling when returning nested records. (And
some other minor fixes related with NULL issues.)
Added SRF functionality. (Using materialize mode instead of value-per-call. See
related comment lines in the handle_func_res() body.)
Modified Files:
--------------
plscheme:
plscheme.c (r1.12 -> r1.13)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plscheme/plscheme/plscheme.c.diff?r1=1.12&r2=1.13)