* Added recent versions to ecflow/package.py, as well as added a cxxstd variant that is
needed to set BOOST_NO_CXX98_FUNCTION_BASE appropriately when building with C++17 standard.
* Fixed pep8 style error in the ecflow package.py script.
* Remov
* Removed cxxstd variant since the ecflow cmake configuration was already specifying
to use the c++17 standard for newer versions. The use of the BOOST_NO_CXX98_FUNCTION_BASE
define is now triggered by the ecflow version.
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