Actions: use `mv` instead of renameDirectory (fixes #236)

Authored by michalt on May 5 2016, 10:05 AM.

Description

Actions: use mv instead of renameDirectory (fixes Trac #236)

Implementing moveDirectory by calling into renameDirectory is
problematic because it doesn't work across file-systems (e.g., a
tmpfs based /tmp).

This fixes the problem by calling into mv instead (similarly to
what we do for copyDirectory).