std.path review: update

[Lars T. Kyllingstad]

On Mon, 18 Jul 2011 10:05:07 +0000, Lars T. Kyllingstad wrote:

> On Sun, 17 Jul 2011 21:27:41 +0000, Lars T. Kyllingstad wrote:
> 
>> Based on your comments, I have made some changes to my std.path
>> proposal.  A list of the changes I have made can be found at the
>> following address (look at the commits dated 2011-07-17):
>> 
>>   https://github.com/kyllingstad/phobos/commits/std-path
>> 
>> I believe I have covered most of your requests, with a few exceptions:
> 
> It seems I forgot about the CTFEability tests.  I'll fix that too, and
> push the updated code later today.

Done.  Most functions were CTFEable without any modifications (thanks, 
Don!). :)

The exceptions are relativePath (because of std.algorithm.cmp) and 
expandTilde (which is strictly a run-time function).

-Lars