add 4.2 stable drupal folder to d6 repo

4.2.7 updates to drupal folder

increment module versions to 4.2.9
set mysql connection timezone in civicrm.module
For d6 we have no sites using html_purifier module so won't worry about
civi imcompatibility
Revert "Proposed CRM-11966 Html_purifier module incompatibility"

This reverts commit 44061e3870a4ac23d6b6de31430638154c7c2db0.
CRM-13397 dont allow contribution pages to submit more than once
use drupal table mechanism for prefixing
partial revert onCRM-13598 d6
add next button fix for double submit protection
CRM-13675 add sorting to membership form
CRM-13696 - Tag listing in remove Tag action has an unclosed div
Merge branch '4.2-d6' of github.com:fuzionnz/civicrm into 4.2-d6
CRM-13726, R4914 only show same as above box if ... there is an address above