bond_angle: add alternative calls
readme: update bond_angle methods
dih_angle: add alternative calls
readme: update dih_angle methods
Merge branch 'dih_angle' into develop
read_gmx: add trailing blanks to println
readme: update xdrfile installation instructions
install_xdrfile: add shell script for installing xdrfile library
read_ndx: fix bug in changing number of digits
Merge branch 'hotfix' into develop