use correct data type inside Cursor Location Values panel

[Andreas Janz]

It seams that pixel values are always reported in double-floating point precision. Use the data type that is given by the raster itself.

1. This way an integer value (e.g. 3) is not reported with a trailing .0 (e.g. 3.0).
2. But more important, the double-precision is altering single-precision values! A 0.0379 becomes a 0.03790000081062317.

[Benjamin Jakimow]

fixes #445

Signed-off-by: jakimowb [e-mail]

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