[Rd] history function does not work correctly (PR#13645)

[jadler at alum.mit.edu]

Full_Name: Joseph Adler
Version: 2.8.1
OS: Mac OS X 10.5.6
Submission from: (NULL) (71.142.93.52)


According to the help file, the history() function is supposed to show recent
command history. However, it does not do this in the current Mac OS X version.

Instead, the history function appears to simply show the contents of the file
~/.Rhistory.