I discovered the linking issue while investigating #291.

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

work on octomap and README.md

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>

hector-mapping: initial commit

frontier-exploration: initial commit

updates and tuning until mid of January 2015

Generalize construction of ros_prefix and use it consistently

festival: correcting audsp path (resolves #309)

roslaunch: Use as documented environment

ROS and catkin packages install their assets to paths prefixed by
ros_prefix. As the recipe was trying to collect the assets for the dev
package in the wrong locations, the dev package was empty.

To address this we use the ros_prefix consistently across the recipe.

In special situations, the prefix used by yocto is prefixed by an
additional staging dir and thus not always starting at /. The current
class already covered the special case for building native packages, but
was erroneous when trying to build nativesdk packages.

Instead of dealing with these special cases ourselves, we can prefix the
ros_prefix with yocto's base_prefix. This prefix will contain any
additional dirs yocto decides to use and will therefore always result in
valid directory variables automatically.

Fixing various QA warnings

Solves following warning:
QA Issue: speech-tools requires /usr/bin/perl,
but no providers in its RDEPENDS [file-rdeps]

Solves following warning:
QA Issue: roslint requires /bin/bash,
but no providers in its RDEPENDS [file-rdeps]

roscore-default: Removing not supported variable in variable
roscore-default: Adding PATH, LD_LIBRARY_PATH and PYTHONPATH
roscore.service: Using /opt/ros/hydro/bin instead of /usr/bin to launch
roscore

You can now install roslaunch-systemd :

opkg install roslaunch-systemd

and start roscore :

systemctl start roscore