add copy of lib/Chj/FP/HashSet.pm
HashSet: fix docs
create Chj::FP::Hash
create Chj::Config
remove wrong comment

Aha: the UI actually *is* visible at that point! No need for the
program to enter the main event loop.
adapt
whitespace fixes
move code to Chj/Recordvideo/Processes.pm
huh, fix?
works, but checks filename.suffix

well whatever
update on stop
avoid 'filename already used' status message to appear
touchups