plowdel: add --longhelp command-line option

Conflicts:
	src/delete.sh
plowlist: add --longhelp command-line option

Conflicts:
	src/list.sh
bash completion: add missing option --longhelp

Conflicts:
	etc/plowshare.completion
docs (man pages): minor update

Changes:
plowdel.1: add "Miscellaneous options" subsection
plowup.1: add missing --folder common module option

Conflicts:
	docs/plowdel.1 (no --plowsharerc option for plowshare3)
plowdel: add captcha command-line switches

Some hosters have captcha during login process.

Added options:
--9kweu
--antigate
--captchabhood
--deathbycaptcha
--captchamethod
--captchaprogram

Documentation updated.

Conflicts:
	etc/plowshare.completion
	src/delete.sh