======MARC Edit Window Tiling======
====Overview of New Feature====
Proposed feature is to add MARC edit horizontal or vertical windows. This would allow librarians
to view/edit MARC records side-by-side or above-below.

This change is to staff client only.
====Changes to Existing Code Base====
The following js/dtd/xul files would be modified:

  *./Open-ILS/xul/staff_client/chrome/content/main/main.js
  *./Open-ILS/xul/staff_client/chrome/content/main/menu.js
  *./Open-ILS/xul/staff_client/chrome/content/main/menu_frame_menus.xul
  *./Open-ILS/web/opac/local/en-us/lang.dtd

New code would be added to these files. Existing functionality would not be changed.

====Description of New Functionality====		
Two new options would be added to the staff client <File> pull-down. These two options would be:
  *"Tile MARC record horizontal"
  *"Tile MARC record vertical"
When "Tile MARC record horizontal" or "Tile MARC record vertical" is selected, for each "Bib Record" tab which
is open, a new window will be opened, and the MARC record associated with that bib record would be displayed.

The MARC record is opened in "edit" mode.