Extend version information output

The output of 'gmx -version' now identifies more configuration options
that have been introduced for 5.0:
- Whether C++11 compilation was enabled when compiling the library.
- What version of Boost was used, and whether that was internal or
  external.
- Whether TNG support was configured in.

Change-Id: I5a00165d1d66d0221e895f9c13c28309b904dafa