reda 0.4.0

New features

• Added function simEvent and simEventData for simulating survival,
  recurrent event, and multiple event data from stochastic process point of
  view.
• Added function mcfDiff and mcfDiff.test for comparing two-sample MCFs by
  difference estimates over time and the pseudo-score tests.
• Added argument origin to function Survr for modeling processes with
  different time origins.
• Added variance estimates of sample MCF from bootstrap methods.

Major changes

• Updated checking rule of argument event of function Survr for modeling
  sample MCF of cost in addition to number of events.
• Updated Lawless and Nadaeu (1995) variance estimates in method mcf.formula
  for sample MCF.
• Renamed class sampleMcf to mcf.formula, rateRegMcf to mcf.rateReg,
  baseRateReg to baseRate.rateReg, summaryRateReg to summary.rateReg.

Minor changes

• Allowed formula Survr(ID, time, event) ~ 1 for modeling baseline rate
  function using gamma frailty model in function rateReg without specifying
  any covariate.

Bug fixes

• Fixed possible label mismatching in plot,mcf.formula (previously
  plot,sampleMcf) method.