Fixed psql \h SELECT

I added the following test to psql/help.c:
               /* if we have an exact match, exit, fixes \h SELECT */               if (strcasecmp(topic,
QL_HELP[i].cmd)== 0)                   break;
 

This will exit the help loop if an exact match has already been found. 
This prevents \h select from showing SELECT INTO help.  Peter, hope you
are OK with this.

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