Begin cleanup on additem.

Begin cleanup on additem.

REFACTOR logic out of conditional branches when the assignment ($nextop) is the same.
Be sure to EXIT after printing a redirect, instead of wasting clock filling in the
template for a process the user will never see.  Remove  the now inapplicable logic for
differentiation between "/cgi-bin" and "non /cgi-bin" installations.  There is no
longer any /cgi-bin in the actual directory file path.

This does not fix the value_builder js errors like "Blurbarcode52251 is not defined",
but it does not cause them either (see Bug 2919).

Signed-off-by: Galen Charlton <galen.charlton@liblime.com>
Signed-off-by: Henri-Damien LAURENT <henridamien.laurent@biblibre.com>