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Hi,

when one wants to use dynamic_reconfigure usually crates cfg folder as you did. You do not need __init__.py in the cfg folder.

after that you should call following in your CMakeLists.txt:

generate_dynamic_reconfigure_options( cfg/params.cfg )

To answer concrete on your questions.

You should never change default target locations of your files in ROS in that way you will just get problems. ROS will after building the workspace with the package automatically create in your ros folder build and devel subfolder. When you execute source ros/devel/setup.bash you will have all paths of your system set-up correctly.

1. They will be crate in the sub folder ros/devel all header files for cpp and modules for python
2. You will get your generated headers in ros/devel/include/_package_name_/include

For more detail see: https://wiki.ros.org/catkin/workspaces and https://wiki.ros.org/dynamic_reconfigure