use dfsane with M=1 instead of BBsolve; it's a convex problem after all
comment on source for equations in implementation
explicitly test evaluation of objective function
aggregate identical household types, implement prior weights (so far only internally)
refactor: rename local variables
function `ml_fit_entropy_o`: new parameter `verbose`
function `ml_fit_entropy_o`: rename argument `BBsolve_args` to `dfsane_args`
`verbose` is also available for the `ml_fit` function
Roxygenize
new function `flatten_ml_fit_problem`
update NEWS
Merge branch 'dfsane'
Bump version to 0.0.9