Enhancement: allow ":" as valid filename char on unix

[nzskiwi]

":" is not a valid filename character on windows, but is
on unix.

after transferring a file (say ".qmail-file.zilla")
to a unix system filezilla produces an error when
attempting to rename it to

".qmail-file:zilla"

Enhancement: allow filezilla to use ":" as a filename
character on unix systems.

[codesquid]

This bug report has been closed due to inactivity and has possibly
already been solved.

You can reopen this report if the issue still exists in the
latest version of FileZilla (Server).