Renamed method "RsFiles::CopyFile" to "RsFiles::copyFile" (lower case) to avoid renaming of "CopyFile" to "CopyFileW" with the newly included "windows.h".
From windows.h
#define CopyFile CopyFileW
git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@6415 b45a01b8-16f6-495d-af2f-9b41ad6348cc