updated for version 7.4.006
Problem:    mkdir("foo/bar/", "p") gives an error message. (David Barnett)
Solution:   Remove the trailing slash. (lcd)
Added tag v7-4-006 for changeset 2374a05efe20
updated for version 7.4.007
Problem:    Creating a preview window on startup leaves the screen layout in a
	    messed up state. (Marius Gedminas)
Solution:   Don't change firstwin. (Christian Brabandt)
Added tag v7-4-007 for changeset 4fe1dfc7014e
Auto version upgrade (7.4.007)