rearranged indentation of examplarily folder structure for yade complation

this commit improves revno: 4101.

Signed-off-by: Alexander Eulitz <alexander.eulitz@iwf.tu-berlin.de>
Added hint about make errors during compilation
when user does not posses root priviledges.

As well for yade as for yade-doc compilation.

Signed-off-by: Alexander Eulitz <alexander.eulitz@iwf.tu-berlin.de>