* Fixed bug in Function.rms - undefined Nam[[i]] if strat.  Thanks: douglaswilkins@yahoo.com
   * Made quantreg be loaded at end of search list in Rq so it doesn't override latex generic in Hmisc
   * Improved plot.summary.rms to use blue of varying transparency instead of polygons to show confidence intervals, and to use only three confidence levels by default: 0.9 0.95 0.99
   * Changed Surv to Srv; use of Surv in fitting functions will result in lack of time labels and assumption of Day as time unit; no longer override Surv in survival
   * Changed calculation of Dxy (and c-index) to use survival package survConcordance service function when analyzing (censored) survival time; very fast
   * Changed default dxy to TRUE in validate.cph, validate.psm
   * Dxy is now negated if correlating Cox model log relative hazard with survival time
   * Removed dxy argument from validate.bj as it always computed
   * Added Dxy to standard output of cph, psm
   * Added help file for Srv