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use a better filter to scale the image

now it uses a style similar to the scales in the gtk+ color chooser.

to avoid a scale resize when the value is 100 or -100

do not reset the scale to 1

truncate the value instead of rounding it.

use float operations instead of fixed operations, optionally use vector
operations if the compiler supports them.

added other points where the cancellable is checked

to avoid possible out-of-memory errors.

similar to  cairo_image_surface_create but returns NULL on error.

it is already checked in the lines above

initialize the tables inside a mutex lock

save the colors in little ending order

the box filter is fast and gives good quality when scaling big images to
thumbnails.

this avoids to converts the GdkPixbuf to a cairo_surface
each time a thumbnail is drawn on the screen.

this partially reverts commit f3840461