Serials: allow freer input in holding code mini-wizard

Serials: allow freer input in holding code mini-wizard

In the Subscription Details interface of the Alternate Serials Control
View, under the Issuance tab, if you create a new issuance you can
now enter things like "01/02" in (say) the month field to denote a combined
January/February issue.  All those fields are now free-form, whereas some of
them used to be numeric only.

Also, avoid an occasional issue where an error message about
dijit.form.DateTextBox not being a constructor would appear in the
JavaScript console.  The problem was in a race condition among some
co-dependent JavaScript files that were all being loaded at the same
time.

Signed-off-by: Lebbeous Fogle-Weekley <lebbeous@esilibrary.com>