Clean up crmAccordion code

To document the changes:

• It's no longer necessary to call cj().crmAccordions() multiple times per page. Even accordions added via ajax will be handled.

• crmaccordions is now crmAccordions (camelCase)

• the css classes crm-accordion-open & crm-accordion_title-accordion have been removed as superfluous.

• the css class crm-accordion-closed has been renamed "collapsed"

• the markup <div class="icon crm-accordion-pointer"></div> is no longer needed and has been removed.

• a simple, collapsible div has also been defined, reusing js and css from crmaccordions. It can be used when accordion styling is not desired.

• open/close animations added

• "active" class added to indicate that an accordion has content. on the contact/edit screen this now works in realtime

• accordions in advanced search can be cleared via a link in the header

• a new method cj('#selector).crmAccordionToggle(speed); has been added to make opening/closing an accordion via js easy and consistent.