Warped image intensity range larger than floating image intensity range with default reg_aladin parameter (linear resampling) about niftyreg

[fepegar]

Pasting some relevant lines after discussion with @pmehta1203 trying to figure out if default interpolation was linear:

niftyreg/reg-apps/reg_aladin.cpp

Line 161 in f673b78

int interpolation=1;

niftyreg/reg-lib/_reg_aladin.h

Lines 255 to 258 in f673b78

	void SetInterpolationToTrilinear()
	{
	this->SetInterpolation(1);
	}

[mmodat]

The interpolation is set to linear during the registration optimisation, but the final interpolation to generate the final warped image is cubic interpolation.
If needed, we could add another parameter to user-specify the order of the final interpolation.

[pritesh-mehta]

A parameter to specify the order of the final interpolation would be great. Thanks!