Fixes #834 (again)

PHP can't discern the difference between d/m/Y and m/d/Y when just the date
is submitted to strtotime(). Unfortunately, strptime() is not available
until PHP 5.1.0. This patch forces datepickers to change their values to
YYYY-MM-DD upon submission to disambiguate parsing issues.

Fixes #832

Previously the American date format (m/d/Y) was used exclusively for
formatting dates in the datepicker widget. This patch enables the widget to
be formatted based on the format set in the admin panel.

Fixes #829

The client and scp config ajax request only contain the settings for the
multi-file upload widget. So it doesn't need to be fetched unless the widget
exists on the page

Allows direct editing of XHTML code in the nicEdit pane

Remove default max limit - no size limit is assumed.

Remove ticket.min.js (users can minimize/compress files on thier own)

Add overlay + please wait spinner on form submit

Autosubmit form on load - refresh is called on submit giving it form object
Validate start/stop timeframe in the backend

Remove obsolete functions

Impove row highlighter on table listing.

Use locktime (reply form hidden input) to auto-detect if locking is enabled without the need to ping the backend

Update to fix issue #189: https://github.com/osTicket/osTicket-1.7/issues/189

Change header to match the new names

Add print options supports - staff can now print a ticket thread without internal notes + select paper size on the fly

And remove unnecessary parts of bootstrap.css

Protect againts cross-site request forgery attacks by requiring a special
form-field or header to be sent with requests that modify ticket system
data.

This meant a slight change to the AJAX ticket locking mechanism. It was
defined to lock with a GET request; however, GET requests are defined as
safe methods and should not modify backend data (such as a lock
acquisition). Therefore, the the lock acquire AJAX method was changed to
require a POST method.

Also remove old, no-longer-used staff panel include files