Bug 13437: Trivial edits on marc21 plugins before conversion

Bug 13437: Trivial edits on marc21 plugins before conversion

marc21_field_003.pl: copy-pasta comment about date removed
marc21_field_005.pl: commented use removed
marc21_field_006.pl: old/irrelevant pod lines
marc21_field_007.pl: old/irrelevant pod lines
marc21_field_008.pl: old/irrelevant pod lines, move sub par line twice
marc21_field_008_authorities.pl: whitespace, old/irrelevant pod lines
marc21_field_040c.pl: two commented lines removed
marc21_field_040d.pl: whitespace, commented lines, old/irrelevant pod
marc21_field_245h.pl: whitespace

marc21_linking_section.pl: relocated some comment lines, and replaced a new
CGI object by the one passed in via the plugin launcher (agreed, this may
not be so trivial as the other changes)

Test plan:
These (trivial) changes are hard to test.
Pick a few plugins and verify that behavior is not changed in the marc
editor.
For the brave: Try marc21_linking_section.pl.

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Tried marc21_linking_section.pl :)
(ling plugin to 773$9, create new record, search for parent and check values inserted)
No errors

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>