Flume windows uninstaller should use install log to only delete necessary files.

Comments from Carl Steinbach.

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"RMDir $INSTDIR" will fail if the directory isn't empty, which is a possibility if the user placed any additional files in $INSTDIR after running the installer. Calling "RMDIR /r $INSTDIR" isn't safe since it's possible that the user selected a non-standard installation location like C:\WINDOWS

It looks like the best practice for avoiding this problem is to use the the uninstall macro located here: http://nsis.sourceforge.net/Uninstall_only_installed_files
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