Merge branch 'PHP-5.6'

* PHP-5.6:
  Add missing NEWS entry for revert of bug #41631
  Add CVE ID to bug #68676
  Align email format for recent NEWS entries
  Bug #55508 was fixed in 5.5.19 with 15ba757a, not in 5.5.18
  Add missing NEWS entry for revert of bug #41631
  Add missing NEWS entry for bug #68027
  Align format for bug #68799
  Bug #68361 was fixed in 5.5.20 using 327d4f9a, not in 5.5.19
  Bug #55618 was fixed in 5.5.21 using eaf107c0
  Add security bugs fixed in 5.5.18
  Add CVE ID to bug #68676
  Align email format for recent NEWS entries