pynbody/genetIC: Version 1.2

New features Ability to modify angular momentum (modify Lx, Ly, Lz) Ability to select elliptical region (select_ellipse) Ability to take gradients for the Zel'dovich approximation using a local 4th-order stencil instead of in Fourier space (disable the ZELDOVICH_GRADIENT_FOURIER_SPACE flag) See the updated user manual for more information. Bug fixes & enhancements Fix a segmentation fault which arose in recent versions of GCC with -O2 or higher due to accidentally returning a reference to a local variable Remove some unused variables which led to compiler warnings (@cphyc