Started with arbitrary sector width test.
New method to compute sector mapping based on grid dimensions and not on total sector amount.
Use new way of sector assignment in order to allow arbitrary sector widths.
Test case using arbitrary sector widths.
Adapted error message in gpuNUFFT operator init.
Changed test range and fixed coarse test error.
Use GPU precomputation.
Merge pull request #48 from andyschwarzl/arb-sector-width

Arbitrary sector width. Fix #47.