Changes to libpgtcl

Hi,

I'd like make some changes on the 7.1 (to be) libpgtcl.

1. Make the large object access null-byte safe, when
libpgtcl is compiled against a 8.0 or higher version of
Tcl.

This would cause that a libpgtcl.so built on a system
with Tcl 8.0 or higher will not any longer load into a
pre 8.0 Tcl interpreter. Since Tcl's actual version is
8.3, I think it's long enough for backward compatibility.

2. Add a "pg_execute" command, that behaves almost like the
"spi_exec" of PL/Tcl.

Any objections?

Jan

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