R INSTALL resumes on Win in case of errors (PR#6769)

I just post it not to forget - will try to contribute a fix.

Example: SparseM_0.34.tar.gz

Running
   R INSTALL SparseM
gives an error ("Execution halted"), but resumes the rest of the 
installation procedure and prints "* DONE" at the end. Hence R CMD check 
(either running solely or in maintainer's mode) cannot detect that the 
installation fails. Output:


[SNIP ...]
Creating a new generic function for "solve" in "SparseM"
[1] "solve"
Error in setMethod("model.matrix", "matrix.csc.hb", function(object, 
...) { :
     No existing definition for function "model.matrix"
Execution halted
Execution of package source for SparseM failed
mv: cannot stat `.RData': No such file or directory
   installing demos
[SNIP ...]
* DONE


Also note, that the package installs smoothly on Linux/Unix.
Looks like package "stats" is attached on Unix/Linux during the 
installation, but not so on Windows. I told the maintainer to use 
require("stats") in order to be on the save side. Nevertheless, I think 
we should try to unify the behaviour.


Uwe Ligges


--please do not edit the information below--

Version:
  platform = i386-pc-mingw32
  arch = i386
  os = mingw32
  system = i386, mingw32
  status =
  major = 1
  minor = 9.0
  year = 2004
  month = 04
  day = 12
  language = R

Windows NT 4.0 (build 1381) Service Pack 6

Search Path:
  .GlobalEnv, package:methods, package:stats, package:graphics, 
package:utils, Autoloads, package:base