Wavelet Fixes

*Small bug fixed (decidedly non-power-of-2 images sometimes had important wavelet-coefficients zeroed out). Thanks, Christian Lange!*
Wavelet code updated to version 2.5.2 (including source). Improved the quantiser-selection for bit-limits (i.e. file-size) a LOT (was a bit stupid before – I only optimised for the smallest difference in maximum and minimum mean square error) -> much better results for same size, changed compile-settings slightly (should be faster) and added a bitplane / quantiser display to the GUI. Get it here!

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