Requested by several CERTI users.

certi CMakeLists.txt use target_include_directories and other target
relative method introduced in 2.8.11

Changes include partial support of IEEE-1516 v2010 API.

At the package level:
    - switch to a stable package
    - take ownership of the package

In the no gui case, set FORCE_NO_X11, so the package does not try to
autodetect X11 stuff.
Must fix the build of bulk on fedora

CERTI is an Open Source HLA RTI. HLA (High-Level Architecture) is a
general purpose architecture for distributed computer simulation
systems. In HLA systems, the RTI (RunTime Infrastructure) manages data
exchange between simulations. CERTI supports HLA 1.3 specifications (C++
and Java) and partial IEEE 1516-2000 (C++).