Changes up to v1.7.3 released

Conflicts:
	WHATSNEW.md
	css/osticket.css
	scp/css/scp.css

Fixes #834 (again)

Allow embedding videos via <iframes>

Reviewed-By: Peter Rotich <peter@osticket.com>

If the HTML ticket thread is enabled and the message is not explicitly
declared to be text, then assume it is an HTML message.

Also ensure that the ticket thread is displayed in a <div> container as some
browsers seems to frown upon <iframe>s in <td> elements

Fixes #75

Await draft deletion before refreshing the page 

Reviewed-By: Peter Rotich <peter@osticket.com>

Fix oops in upgrade of %help_topic table

Reviewed-By: Peter Rotich <peter@osticket.com>

Fix oops in htmLawd callback for HTML cleanup

Reviewed-By: Peter Rotich <peter@osticket.com>

Fixup templates to work with Redactor in line break mode

Reviewed-By: Peter Rotich <peter@osticket.com>

If the [reset] button refreshes the page, ensure the draft deletion is
completed before the refresh is performed or the draft deletion will be
canceled.

formset_id was not renamed to form_id after our rebase

Fix parsing issue in strtotime()

Reviewed-By: Peter Rotich <peter@osticket.com>

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

Remove placeholder text if found in the draft save

Reviewed-By: Peter Rotich <peter@osticket.com>

And freshen up the upgrading guide

The issue has been filed with Imperavi, but no ticket number or other
tracking information was returned.

Also, if any non-shipped .htaccess files exist, don't clean those either

Fixes #60

This will hopefully remove some of the confusion from the repeated
names in the various initial data

Include changes made just before 1.7.3 release

Conflicts:
	include/ajax.config.php
	include/class.ticket.php

Use seemingly-random form input names

Reviewed-By: Peter Rotich <peter@osticket.com>

Add %{ticket.user} to ticket template variables

Reviewed-By: Peter Rotich <peter@osticket.com>

Fix oops in text email conversion

Reviewed-By: Peter Rotich <peter@osticket.com>

Provide fallback functions for mbstring module

Reviewed-By: Peter Rotich <peter@osticket.com>

Advertise new prerequisites on install and upgrade

Reviewed-By: Peter Rotich <peter@osticket.com>

Make cacheable more portable

Reviewed-By: Peter Rotich <peter@osticket.com>