Adjust installation routines

Add uninstall target to Makefile
Consider upgrade in debian postrm and postinst

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Integrate necessary codepages for booting into kernel

Ensure that the kernel boots even if the modules cannot be read.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>