[darcs patch] filepath: normalise trailing dot

[Conrad Parker]

Hi,

the attached darcs patch modifies the behaviour of normalise to handle
trailing dots in a path. The previous behaviour yielded this:

Prelude System.FilePath> normalise "../."
"../."
Prelude System.FilePath> normalise ".././"
".././"
Prelude System.FilePath> normalise ".././.."
"../.."

This patch modifies dropDots such that the check for (".":[]) only
occurs once for the path, after which a driver function dropDots' is
used which skips this check. Hence "." can be removed from the end of
a longer path, but a path of just "." is unchanged.

(my trac account is pending verification, I'll reply with a trac
ticket # later if needed)

cheers,

Conrad.
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