use template constants in tested easyconfigs
enforce operator in toolchain version strings, ' == ' should be used instead of ' '
fix toolchains spec in other format 2.0 test easyconfigs
rework class parameter for EasyBlock/EasyConfig to build_options and build_specs
adjust to changed EasyBlock/EasyBuild class parameters
adjust unit tests to changed EasyBlock/EasyBuild class parameters
clean up arguments for parse method
add parser.set_specifications, free get_config_dict from arguments
fix minor remarks + docstrings