ACQ invoice inline lineitem search and add

ACQ invoice inline lineitem search and add

The Invoice UI is how composed of two tabs, the main invoice tab and a new
Search tab.  The search tab consists of a subset of the Acquisitions unified
search interface.  The goal is to allow users to search for lineitems to
invoice.  Search results may be added directly to the growing invoice.  A
number of small usability features are included.

Features
~~~~~~~~

    * Option (default) to limit searches to invoiceable items.
        ** These are lineitems that are not cancelled, have at least one
           invoiceable copy, linked to a PO whose provider matches that of the
           current invoice, and are not already linked to the current invoice.

    * Search defaults to last-run search (on workstation).
    * New Lineitem Detail filter options
    * Sort searches by lineitem number (default) and title.
    * There is a new Expected Cost field which includes both the total invoiced
      cost plus the anticipated cost of lineitems as they are added.
    * New Price per Copy field
    * Lineitem count field
    * Show / Hide Invoice details button.  Details are displayed by default, but
      hidden when the user enters the search tab.  From there it remains hidden
      until manually shown (or a new invoice is opened).
    * A new "Save & Clear" button which saves the current invoice then clears
      the invoice display to create a new invoice.
    * Provider, shipper, and receiver fields are auto-populated from the
      first-added invoice data (when not already set).
    * Totals are now read-only, since they are derived from existing data (and
      are informational only).

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