Improving border handling in composition of position fields
Merge branch 'map_coordinates_bug-3'
First implantation of jacobian field computation
nifti stores matrix valued images as vector valued images using row-major ordering. reflect this in code for issue #6
initialise_field was not properly handling using a field as input
First implementation of SVF Lie bracket, cf. issue #9
Merge remote-tracking branch 'upstream/master'
small refactoring to avoid duplicate code + set matrix properties in nifti header of jacobian fields
set_matrix_data_attributes needs to be called for jacobians not displacements
Merge pull request #10 from tvercaut/master

Fix for issues #9 #6 #5 #2