Code tidy.

question.php

questiontype.php

stack/cas/ast.container.silent.class.php

stack/cas/castext2/block.interface.php

stack/cas/castext2/blocks/jsxgraph.block.php

stack/cas/castext2/utils.php

stack/cas/keyval.class.php

stack/cas/parsingrules/996_call_modification.filter.php

stack/maximaparser/utils.php

stack/utils.class.php