Added global RUNPATH settings
Added RUNPATH settings to libecl and applications/ecl_summary
Added macro add_runpath()
Added use_runpath() directives to all binary targets
Changed order of statementts in CMakeLists.txt
Set USE_RUNPATH() to OFF by default
Merge pull request #98 from joakim-hove/CMAKE-RUNPATH

Add option USE_RUNPATH to CMake build system