[Rd] Password security problem in RODBC package (PR#9038)

[bwmoore22 at yahoo.com]

The RODBC package retains the unencrypted user ID and
password used on the odbcConnect() statement as part
of the database object.  This unencrypted user ID and
password are then saved with the .RData and .RHist
files where they can potentially be discovered by
other users.  

To recreate:

0) R version is 2.2.0 with corresponding download of 
   RODBC package

1) library(RODBC)
   dbhandle<-odbcConnect("dbname",uid="user",pwd="")

2) display the user ID and password with
   dbhandle

3) Quit
   q()

4) Respond "Y" to the save data prompt

5) Edit the .Rdata file and search for the user name
   and/or the password.