Confirm Maxia's extra evaluation operator is not supported in STACK. Issue #744.

lang/en/qtype_stack.php

stack/cas/parsingrules/033_no_extra_evaluation.filter.php

stack/cas/parsingrules/parsingrule.factory.php

tests/ast_filter_000_099_common_core_auto_generated_test.php

...1_fix_call_of_a_group_or_function_auto_generated_test.php

tests/ast_filter_002_log_candy_auto_generated_test.php

tests/ast_filter_003_no_dot_dot_auto_generated_test.php

..._filter_005_i_is_never_a_function_auto_generated_test.php

..._filter_022_trig_replace_synonyms_auto_generated_test.php

tests/ast_filter_025_no_trig_power_auto_generated_test.php

tests/ast_filter_030_no_trig_space_auto_generated_test.php

...s/ast_filter_031_no_trig_brackets_auto_generated_test.php

...st_filter_033_no_extra_evaluation_auto_generated_test.php

...ilter_050_no_chained_inequalities_auto_generated_test.php

..._090_special_forbidden_characters_auto_generated_test.php

tests/ast_filter_101_no_floats_auto_generated_test.php

tests/ast_filter_102_no_strings_auto_generated_test.php

tests/ast_filter_103_no_lists_auto_generated_test.php

tests/ast_filter_104_no_sets_auto_generated_test.php

tests/ast_filter_105_no_grouppings_auto_generated_test.php