Implemented parameter to shift multi-resolution main volume in MATLAB

[saarlemo]

Previously the multi-resolution main volume has always been in the center of all FOV. This PR enables off-center extended FOV

• options.oOffsetX, options.oOffsetY and options.oOffsetZ control high-resolution FOV offset as before
• options.FOVa_x, options.FOVa_y and options.axial_fov control the high-resolution FOV size
• options.eFOVSize determines the total size of extended FOV
• options.eFOVShift shifts the extended FOV with respect to high-resolution FOV
• options.transaxialEFOV and options.axialEFOV are determined automatically from options.eFOVSize and options.eFOVShift (see CTEFOVCorrection.m)