Also backport a patch improving generation of config.cmake
files. This makes octomap libraries relocatable which is
required for successful cross-compilation builds.

Signed-off-by: Dmitry Rozhkov <dmitry.rozhkov@linux.intel.com>

When I investigated the issue #291 with Kristof's patch applied,
I noticed that `bitbake octomap` failed.

Due to my inspection, I believe that the inheritance on ros
was only needed as the ROS_SPN and ROS_SP variables were used in
the recipe. After simply using the default variables, BPN and BP,
I removed the inheritance on ros.

Furthermore, as meta-ros only has one recipe for octomap base
library for now, we do not need to split the recipe definition
in an include and a recipe file.
Probably, this was done as premature optimization believing
that the libraries from the octomap repository, e.g., octovis,
would be added shortly after.

Testing with `bitbake packagegroup-ros-world` reported no errors.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@oss.bmw-carit.de>

The description is not indented after line breaks. All other
information, i.e., the dependencies and SRCURI, are indented with
four spaces after line breaks. Shell scripts are indented with
multiples of four spaces.

In recipes-ros, I located and checked for tabulators and spacing
with these bash commands:

egrep '^ [^ ]+' . --exclude *.patch -R
egrep '^  [^ ]+' . --exclude *.patch -R
egrep '^   [^ ]+' . --exclude *.patch -R
egrep '^    [ ]+[^ ]+' . --exclude *.patch -R

While going through the recipes and manually improving the layout,
I also adjusted the descriptions to use maximal 100 characters
per line.