[dokuwiki] notes for the installer

Hi, I'm Diego.
Just some notes on the installer:

On the start test (dir writable ...) i think the failure / problem should be
mark with RED, not green
and should be suggest the action to resolve, not only "You need to fix the
permission settings of this directory!" example: $chmod g+w dokuwiki/data

I think also it is better to place below the test a button "Retry the test"
that perform a page refresh

Sorry for my bad bad english
:: ogeidix

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