Update "View Contact - Inline Editing" to support locking

[ ] Add hidden DIV at page level (outside any individual form section) with attr "data:oplock_ts"
[ ] Add hidden INPUT to each CRM_Contact_Form_Inline_* – oplock_ts:=FIXME
[ ] Add onload event for CRM_Contact_Form_Inline_*: $(input[oplock_ts]).val($(div#oplock_ts).val())
[ ] On validation of each 'CRM_Contact_Form_Inline_*', see if submitted "oplock_ts" differs from the DB's "oplock_ts"

• If it doesn't match, display options to 'Ignore' or refresh the entire screen. 'Ignore' will udpate the page-level and
  form-level "oplock_ts" so that the next click of "Save" will succeed.
  [ ] After submission of successful 'CRM_Contact_Form_Inline_*', return JSON response with revised "oplock_ts"
  [ ] After receiving JSON, extract new "oplock_ts" and update all page-level and form-level elements