* herbs.app.quality_measures (evaluate): Now takes the special
  case 'IPD' into account
* herbs.app.quality_measures (evaluate_IPD): Added. Note: this
  feature needs that both the new SQL keyword 'SQR' and the new
  function 'phi(x)' are interated into sqlite (see below)

* sqlite-2.8.15.patch: Added a new sql keyword: SQR (computes the
  square of a number) and a new function 'PHI(x)' (cumulative
  distribution function of the standard normal distribution)