Simplify disvert data
Currently each variant of disvert has its own instance of ap, bp, presnivs, presinter. Pointers to these instances are set by init_disvert.
Proposed change : have a root module disvert_vars_mod containing a single instance of ap,bp,presnivs,presinter. Allocate the arrays in the main init_disvert. Let each variant fill the arrays.
Edited by Thomas Dubos