Merge pull request #24 from SylvainPlessis/unit

Unit
Silence Antioch::Converter ignored_qualifier warnings
Silence Antioch::InSI ignored_qualifer warnings
Silence Antioch::SIPrefixes ignored_qualifer warnings
Silence UnitBaseStore ignored_qualifier warnings
Silence Units ignored_qualifier warnings
It's rude to change the units and not tell everyone
Merge pull request #65 from pbauman/ignored_qualifiers

Silence warnings from -Wignored-qualifiers
Merge pull request #66 from pbauman/doc_fix

Doc fix
Antioch requires C++11 support
Bugfixes:
  - unit_store: the "g" case is taken into account
  - units: fill_in_power uses develop_symbol before calculations:
        => no more develop_symbol needed before calling it
  - units: some cleaning: indexUnit no more needed
  - unit_unit: added the test [E] = [m] + [c] + [c] has to be homogeneous to Joules