mpkg: install: allow to re-install a package using --redo.
mpkg: install: allow to re-install a package using --redo.

Add --redo argument to command-line.

Example to re-install package a:
$ mpkg install a --redo

Signed-off-by: Gaël PORTAY <1666f60cfa201a60b0ea694168a0b6932673170a@gmail.com>

gazoo74/mpkg,gazoo74/mpkg