abstract methods on top, some doc too
abstract methods on top, some doc too

cdondrup/strands_qsr_lib,cburbridge/strands_qsr_lib,yianni/strands_qsr_lib,yianni/rtd-dbg,Raziel90/strands_qsr_lib,PDuckworth/strands_qsr_lib,strands-project/strands_qsr_lib,pet1330/strands_qsr_lib