Normalize atoms names when searching for elements
Changed max resSeq check and added same check when residue info is not available (#110)
Remove .clang-format
Trusty on travis comes with a modern cmake
Add Frame::{distance,angle,dihedral}
Use proper classes instead of typedef for Vector3D and Matrix3D
Add C API chfl_frame_{distance,angle,dihedral}
Remove _t prefix on C types