Advanced category for configuration options (#125)

Adds advanced category

- advanced category hides less relevant configuration options
- omnitrace-avail has new '--advanced' option which shows these flags
- increase verbosity level to print issue with reading ppid children
- OMNITRACE_ROCTRACER_HSA_ACTIVITY defaults to ON
- OMNITRACE_ROCTRACER_HSA_API defaults to ON

source/lib/omnitrace/library/mproc.cpp

@@ -44,7 +44,7 @@ get_concurrent_processes(int _ppid)
         std::ifstream _ifs{ _inp };
         if(!_ifs)
         {
-            OMNITRACE_VERBOSE_F(0, "Warning! File '%s' cannot be read\n", _inp.c_str());
+            OMNITRACE_VERBOSE_F(2, "Warning! File '%s' cannot be read\n", _inp.c_str());
             return _children;
         }