bcf read fix on large bcf files

Nix configuration for MacOS (silicon)

format

revert Makefile to saner defaults

reverted: check fgetcoli return value in SPR

fixed SPR in BCF mode (check fgetcoli return value)

PDUMP fixed for BPR, SPR in BCF and BM modes

merge

up dotfiles

Fixed SPR divergence count

update computation of spr on BCF. this should work as expected, but it

update io interface for fgetcolwgri from void to int

start fixing spr with bcf

add makefile with proper debug flags

spr badallock fix