Bug 11665: An ability to place orders directly from hold ratios list

This enhancement introduces a possibility to place orders
from hold ratios list:

- new option "Add order to basket" -> "From titles w/ highest hold ratios";
(user gets redirected from acqusition to "hold ratios" list in circulation)

- "N to order" in "Items needed" column now becomes a link - when clicked,
user gets redirected back to acquisition, directly to order form for
a choosen title (suggested quantity "N to order" is being preserved)

- in the "Items needed" column, there is an additional indication if
there are any pending (not yet received) orders for a given title

This solution is not exactly ideal.. most important drawback: to use
it librarian needs both acquisition & circulation priviledges; if not
having both - new options will not show / wouldn't be active. But it
requires relatively small amount of changes in the code.

To test:
- apply patch,
- test new functions (try to place some orders using an newly added
option, examine resulting order records etc.)
- check modified hold ratios list for possible problems (for user
with only circulation priviledges, additional information regarding
pending orders should be still visible, but not the link
to order form)
- ensure the two following existing options for adding orders to basket
("From an existing record", "From a new (empty) record") a still working
properly.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>

Minor edit in signoff: Changed "w/" to "with"

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
This works nicely in my tests, neat new addition.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Bug 11665: (follow-up) simplify code

This patch replaces some of the logic with more direct
Boolean expressions.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>