[UPD] Issue #70 completed. It is now possible to read TRC file with unlabelled markers.
Another fix related to the commit f5a027de4b7c62e5b0c218f70aced6696ce20f6c and Windows.
CMake options BUILD_DOCUMENTATION_README AND BUILD_UTILITY_EASYINSTALL renamed BUILD_INTERNAL_DOCUMENTATION_README and BUILD_INTERNAL_UTILITY_EASYINSTALL as their goal is only to update files in the sources of the project. They can be only activated if the CMake BTK_SHOW_INTERNAL_PROJECT_OPTIONS is set to BOOL:1.