This function cleans up a path string by removing the trailing
slash. This is necessary on MS Windows, file.exists(fn) fails
if "/" is on end of file name. Deleting the trailing slash is thus
required on Windows and it is not harmful on other platforms.
dts(name)Same path with trailing "/" removed.
A path
Paul Johnson <pauljohn@ku.edu>
All usages of file.exists(fn) in R should be revised
to be multi-platform safe by writing file.exists(dts(fn)).
This version also removes repeated adjacent slashes, so that
"/tmp///paul//test/" becomes "/tmp/paul/test".