New NameStr() macro, RelationGetRelationName fixes

I have overhauled the use of RelationGetRelationName() to it is used
more often.

I have added a new macro NameStr to get a char * from Name. No more:

var.data
&var
var->data

to access Name as a character string.

Also, several calls to nameout() were removed and changed to
pstrdup(NameStr(var)). Clearer what is going on.

Can't run regression tests because of psql changes, but at least initdb
worked, and I can query my database.

--
Bruce Momjian | http://www.op.net/~candle
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