pltcl - "Cache lookup for attribute" error - version 2

After a deeper analysis, this post supersedes my
previous one with the same subject.

I got the error message:

ERROR: pltcl: Cache lookup for attribute
'........pg.droppped.7........' type 0 failed

when a pltcl trigger handler is fired.

Attribute names beginning with a dot are filtered
just in one place, in pltcl_trigger_handler().
(version 7.3.5)

Attached is a patch to :
- Add a filter in two other places, in relation
with the mentioned error message:
pltcl_set_tuple_values()
pltcl_build_tuple_argument()
- Add the same filter in the build of TG_relatts.
This will prevent a tcl script which loops on
TG_relattrs to fail in trying to use a dropped
column.

Note 1: the filter method is changed from testing if
attname begins with a dot to testing the setting
of attisdropped.
I presume (to be confirmed or contradicted by a
more authoritative developer than me) that the
original dot filtering intent was to filter
dropped columns. In other words, there is no
case where a column name begins with '.' except
dropped columns. If this is right, testing
attisdropped
is an adequate and more readable replacement.

Note 2: with the addition of the filter in
pltcl_build_tuple_argument(), filtering in
pltcl_trigger_handler() is no more needed, so I
put these lines in comments (may be removed in
a final release).

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