[Rd] tilde expansion with install.packages

[Roger D. Peng]

I've noticed recently that 'update.packages' and 'install.packages' seem to not 
do tilde expansion anymore, i.e. when I run

update.packages("~/R-local/lib")

on R-alpha (r41043) I get the message

/home/rpeng/install/R-alpha/lib64/R/bin/INSTALL: line 304: cd: ~/R-local/lib: No 
such file or directory

and the package is subsequently installed in the current working directory.

The attached patch solves the problem for me.

-roger
-- 
Roger D. Peng  |  http://www.biostat.jhsph.edu/~rpeng/
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