[Rd] Small enhancement for CMD check

[Terry Therneau]

 It would be nice if the 00check.log file also included this part of the
output:
  Running ‘bladder.R’
  Comparing ‘bladder.Rout’ to ‘bladder.Rout.save’ ... OK
  Running ‘book1.R’
  Comparing ‘book1.Rout’ to ‘book1.Rout.save’ ... OK
  Running ‘book2.R’
  Comparing ‘book2.Rout’ to ‘book2.Rout.save’ ... OK

etc.

  The survival package has enough test scripts that it exceeds my
terminal's scroll bar; I have to either watch closely or run
 R CMD check survival >& mylog

Terry Therneau