[R] case-insensitive ZIP

[Primer, Jeremy (FID)]

A development note:

In the function "install.packages", it would be helpful to those of us
who have atypical installations and install manually from ZIP files to
have

	pkgnames <- sub("\\.zip$", "", pkgnames)

replaced with

	pkgnames <- sub("\\.zip$", "", pkgnames, ignore.case = TRUE)

because the contributed zipfiles are ZIPfiles. The routine did not work
for me out of the box.


Jeremy Primer 
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