[Rock-dev] New ROCK_CMAKE_MACROS environment variable

[Sylvain Joyeux]

As discusses on the ML a while back, the current

   include(Rock)

is not ideal as it makes running cmake outside of autoproj pretty hard 
(one has to give a -DCMAKE_MODULE_PATH=/path/to/rock/macros to every 
cmake call).

The proposed change was to use an environment variable and change the 
CMake template to do

   include($ENV{ROCK_CMAKE_MACROS}/Rock.cmake)

I just did that, while keeping backward compatibility for now.

I modified:
   rock.base autoproj configuration to define ROCK_CMAKE_MACROS
   base/types/cmake/Rock.cmake to add ROCK_CMAKE_MACROS to CMake's
     module path
   the cmake-lib template to use the new include() statement.
-- 
Sylvain Joyeux (Dr.Ing.)
Space & Security Robotics

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