[PATCH] check for valid user input in FifteenPuzzle

[Thomas Coopman]

Hi,

This patch checks if the user enters a valid file (checks if the file exists).

Also if the pixmap cannot be loaded it uses the default pixmap.

The patch also contains support for selecting background and
foreground colors (as previously send but it now uses the old default
colors)
I can remove that if necessary

-- 
Thomas Coopman
Thomas.coopman at gmail.com
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