Made most OS dependent path calls into separate functions for UnixInstall
Chagned WindowsInstall OS dependent path calls to match UnixInstall
directories() is now OS independent
Only warn in WindowsInstall.dir_eq_link if paths aren't equal
Create a tempfile in a dir to see whether the symlink points to the same dir
Fix typo in constructing temp file name
Merge pull request #53 from manics/windows_symlink_dereference

Windows symlink dereference (so old servers can be deleted)