omnitrace -> omnitrace-instrument (#256)

* omnitrace-exe -> omnitrace-instrument

- Renamed omnitrace executable to omnitrace-instrument
- Provided dummy omnitrace exe which forwards onto omnitrace-instrument
- updated all docs to reflect the name change of the executable
  - however, it is possible some were missed

* Update dyninst submodule

- correctly handle BOOST_LINK_STATIC in DyninstBoost.cmake

* Disable IPO for omnitrace-instrument

source/docs/user_api.md

@@ -167,7 +167,7 @@ custom_push_region(const char* name)
 ### User API Output
 
 ```console
-$ omnitrace -l --min-instructions=8 -E custom_push_region -o -- ./user-api
+$ omnitrace-instrument -l --min-instructions=8 -E custom_push_region -o -- ./user-api
 ...
 $ export OMNITRACE_USE_TIMEMORY=ON
 $ export OMNITRACE_USE_PID=OFF