Digia-generated Windows installer contains redundant copies of .dll's

After installation, the Desktop\Qt\5.0.0\msvc2010\lib folder contains duplicates of most of the .dll files from Desktop\Qt\5.0.0\msvc2010\bin. The duplicate files total to around 38Mib for the 32-bit build and 46Mib for the 64-bit build.

As discovered in the Qt 4.x lifecycle, this duplication is unnecessary – it was sufficient to put the .dll's in the bin folder so that they are found when that folder is added to the %PATH%. I expect that the same is true for Qt 5.