Fix task data

[mb706]

This fixes a few discrepancies I found in the task files in the data directory:

• the "surv" tasks had type "regr" which was fixed in Fix 2101 surv task type #2102 but had not propagated to the builtin data. Affected lung.task, wpbc.task.
• The "surv" tasks had the $censoring slot which was removed from "surv" tasks in Improve Survival stuff #1833. Affected lung.task, wpbc.task.
• Some of the classif and multilabel tasks were missing the class.distribution slot. Affected bc.task.spatial, costiris.task, gunpoint.task, phoneme.task.
• (minor) yeast.task's task.desc had names in a different order than other task.descs

The Assumption I am making here is that changeData(task, getTaskData(task, functionals.as = "matrix")) should always be all.equal the original task. I added a test that verifies this for the builtin data. Please don't merge this if this assumption is wrong.

The tasks were fixed from the original data using the script

# in the 'data' subdir
for (x in list.files()) {
  load(x)
  xname = gsub("\\.rda$", "", x)
  xdat = get(xname)
  xdat2 = changeData(xdat, getTaskData(xdat, functionals.as = "matrix"))
  if (isTRUE(all.equal(xdat, xdat2))) next
  assign(xname, xdat2)
  save(list=xname, file=x)
}

[larskotthoff]

Thanks for fixing this, merging.

We should probably make it part of the travis build to regenerate the data files so things like this can't happen.