OTF2 config tool

A call to otf2-config has the following syntax:

Usage: otf2-config [OPTION]... COMMAND

Commands:
  --cflags     prints additional compiler flags. They already contain
               the include flags
  --cppflags   prints the include flags for the OTF2 headers
  --libs       prints the required libraries for linking
  --ldflags    prints the required linker flags
  --cc         prints the C compiler name
  --features <FEATURE-CATEGORY>
               prints available features selected by <FEATURE-CATEGORY>.
               available feature categories:
                * substrates
                * compressions
  --help       prints this usage information

  --version    prints the version number of the OTF2 package and
  --otf2-revision
               prints the revision number of the OTF2 package
  --common-revision
               prints the revision number of the common package
  --interface-version
               prints the interface version number

Options:
  --backend
               on systems, which required cross-compiling, this flag
               specifies that the information for the backend is displayed.
               By default the information for the frontend is displayed.
               On non-cross compiling systems, this flag is ignored
  --nvcc       specifies that the required flags are for the CUDA compiler
               nvcc