`py-result' is string, not list

py-shell delay unified
minor changes

README.DEVEL.org updated
`py-fast-filter-re', `py--unfontify-banner' fixed
defvar prompts-regexp, minor fix
`py-split-window-on-execute-p' new default: 'just-two

Some more tests:
py-split-just-two-window-on-execute-lp-1361531-...

manage-windows fixes