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/bin/omnitrace-avail/common.cpp

@@ -42,6 +42,7 @@ bool              case_insensitive    = false;
 bool              regex_hl            = false;
 bool              expand_keys         = false;
 bool              force_config        = false;
+bool              print_advanced      = false;
 int32_t           max_width           = 0;
 int32_t           num_cols            = 0;
 int32_t           min_width           = 40;