Warn earlier about trying to install to root or home path.

Change-Id: Ic5e6e207a140158edc15c09c6cf7af3b36ac1139
Reviewed-by: Karsten Heimrich <karsten.heimrich@digia.com>
Use non-static remove, same as with exists.

Change-Id: I5e7fd0bbdee35daf76caf1fe192a1f57362642ab
Reviewed-by: Karsten Heimrich <karsten.heimrich@digia.com>