[WIP] Catkin build

[WIP] - To be tested by others.

Enable use of catkin build (catkin_tools).

It allows for a much simpler setup of the required workspace for development in wolf - see update in README.md -.

However the former compilation flow should still work. Well up to cd347095ef0dd040a706f04818f889ee4f6d80fb I guess.

Added 3 commits:

• 50521aac - fix error: comparison of unsigned expression >= 0 is always true [-Werror=type-limits]
• 422170ce - fix unused / uninitialized var -Werror=uninitialized -Werror=unused-variable
• 175baf6d - fix error: type qualifiers ignored on function return type [-Werror=ignored-qualifiers]

Added 1 commit:

• a32f2407 - fixed compilation with enabled Werror

Mentioned in issue #18 (closed)

Mentioned in merge request !82 (merged)

@jsola Just for the record, this is how looks like a pull request that do not merge properly I'm fixing that.

Status changed to closed