CLN/TST: clean up and raise on bs4 version and no tables
closes #4214

@jreback u ok with this?
 does 4.2.0 work _sometimes_ eg it will occasioanlly parse things
???

I would maybe steer clear and have it just raise on this version always
it's essentially a known failure and there are options to upgrade/downgrade

but ok either way
 trivial to test that way, so i think i'll do that
 @jreback shall i merge?
 on second thought maybe we should wait for @yarikoptic?
 go ahead

he will test against master
