ansible-galaxy currently behaves bad then a role to be installed
contains ~ or $ at any place in the path of a file in that role.
It extracts the parent directory of the offending path level as an
empty file. This explodes if that directory contains anything else.
Change this behaviour. `~` is now allowed allowed when it is
not a full level (Yes: `some~thing/`, no: `~/`). The code should
get refactoring in an other PR.
