Merge branch 'hotfix-failed-test-nfft' into develop
safer flag management, allow only supported flags to be used
typo fixes
update autogen files
add test for managed flags
pep8 clean
typo fix
move flag manegement internals to pxd file
pep8 clean
move flag mangement internals to pxd
pep8 clean
replace import * by clear list of needed import
update autogen files
make flag management code consistent with NFFT code
update autogen files
fix errors introduced by moving some definitions out of the .pyx files
initial commit
copy function declarations from nfft3util.h
initial commit
add support for util