updated for version 7.4.503
Problem:    Cannot append a list of lines to a file.
Solution:   Add the append option to writefile(). (Yasuhiro Matsumoto)
Added tag v7-4-503 for changeset 094a87e76155
updated for version 7.4.504
Problem:    Restriction of the MS-Windows installer that the path must end in
	    "Vim" prevents installing more than one version.
Solution:   Remove the restriction. (Tim Lebedkov)
Added tag v7-4-504 for changeset edfa81ea1711