a little css organizing
sizing and scrolling for file upload panel

fixes #586
reset progress bar on choosing new file

fixes #587
reshadow when anything sizes

fixes #573
mismatched tag
artifacts
delete obsolete css
more shadow sizing tweaks
dead code
cleaner opening; cleaner code

start with all panels minimized and then show the chosen ones
detect column widths from css rather than coding them twice
don't even consider "outs" as collapsible

fixes #564
clear session info on reset session

seems to have gotten lost in the progress UI cleanup 0924f83b
fixes #422
it takes a couple more steps to show help frame now
fixes #368