can I indicate that an old version is not to be used, and some more questions

[S. Doaitse Swierstra]

I uploaded a version of the uu-parsinglib to hackage. Only later I discovered that it depended on a verion of base >= 4.2, whereas I indicate > 4 in my .cabal file. 

I repaired this by uploading a new version in which only the cabal file has changed. This raises the following questions:

 - the Haskell code did not change, but I still had to bump the version number?
 - can I remove the incorrect version or indicate that it is superseded by the new version?
 - since I do not have a wide variety of Haskell installations and package versions on my machine, 
   it would be very nice if the hackage server could test a package against the extremes of the indicated dependency 
   ranges before installing. This would have prevented the mistake I made (and which undoubtedly others will make too)

Doaitse