split class two tests into two variants 2a and 2b with pcff and compass
fix typos
rename class2 reference files, too
clean up box handling by using a separate storage for LAMMPS data
shift box to be around the geometric center of the coordinates
add flag to make recentering optional
update readme
include support for MKL
add support for dihedrals and impropers and more class2 coeff sections
update reference data for shifted boxes
support more types of comparison.
include ethane test for class 1 force field
add write_data support for class2 dihedrals
add write_data support for class2 impropers
update reference data after implementing write_data into class2 impropers
add write_data support to cvff impropers
we need to output cvff style imporpers for class1 not harmonic
made the code for writing dihedrals coeffs more readable.
replace needless use of fprintf with fputs
add set of benzene molecule tests
minor formatting improvement