Bug 22734: Fund not marked as mandatory when ordering from a staged file

Bug 22734: Fund not marked as mandatory when ordering from a staged file

This patch does some refactoring of JavaScript to make handling of
required fields more robust. It also moves some template JavaScript to
the footer and some to a separate file.

A fallback "pattern" attribute is added to the quantity field, requiring
0-9+ values.

The "required" property of the funds dropdown is now dependent on the
value set under the "Default accounting details" tab. If a default is
selected, the individual item funds are preselected and not marked
required.

To test, apply the patch and begin the process of ordering from a staged
file.

 - Select all items to import.
   - Under each item, the fund should be marked mandatory.
   - The quantity field should accept only numbers.
   - Select the "Default accounting details" tab and select a default
     fund.
     - Return to the "Select to import" tab. Your selected default fund
       should now be preselected under each item. The fund should no
       longer be marked required.

       Un-selecting a default fund should result in each item fund
       select becoming required.

Signed-off-by: Séverine QUEUNE <severine.queune@bulac.fr>
Signed-off-by: Séverine QUEUNE <severine.queune@bulac.fr>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>