Log Message:
-----------
Previous explanation of SPI execution functions are quite wrong. Fixed them and
placed a detailed description for every introduced function and symbol.
Modified Files:
--------------
htdocs:
index.html (r1.11 -> r1.12)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plscheme/htdocs/index.html.diff?r1=1.11&r2=1.12)