removed semicolons from comments

(mucks up logic in install.php)
and fixed stray commas that stopped it parsing as valid SQL

db/laconica_pg.sql

@@ -120,6 +120,7 @@ create table notice (
     conversation integer /*id of root notice in this conversation' */ references notice (id)
 
 
+
 /*    FULLTEXT(content) */
 );
 create index notice_profile_id_idx on notice using btree(profile_id);