Log Message:
-----------
Improve tab whitespace in file.
Add comment about $$ and '' SCONST strings.
Modified Files:
--------------
pgsql/src/interfaces/ecpg/preproc:
preproc.y (r1.317 -> r1.318)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/interfaces/ecpg/preproc/preproc.y.diff?r1=1.317&r2=1.318)