Serials: A batch of improvements to the caption/pattern wizard

Serials: A batch of improvements to the caption/pattern wizard

- Using a numeric frequency ($w) now pre-selects the regularity page
- Switch the regularity page from a box layout to a grid layout for legibility
- Simplify and unify month/date control pairs, enforcing correct limits
    on days in each month
- Scrollbars!
- If the user creates $y data in the regularity page, but then unchecks the
    "use specific regularity information" box, the $y stuff will be correctly
    excluded from the compiled pattern code.
- "Display in Holding Field" replaced with text that better explains what it
    means
- The wizard's dialog window has a title now
- In alternate serials control -> subscription details -> captions/patterns tab,
    if the user has already typed something in the Pattern Code field, they
    now get a warning that using the wizard will erase their existing work
    if they click the Wizard button
- The captions/pattern tab now treats pattern codes as immutable once created,
    which is what was apparently intended from the beginning.  See
    http://list.georgialibraries.org/pipermail/open-ils-dev/2010-May/006079.html

git-svn-id: svn://svn.open-ils.org/ILS/trunk@19272 dcc99617-32d9-48b4-a31d-7c20da2025e4