Code tidy.

lang/multilang.php

question.php

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

stack/cas/caserror.class.php

stack/cas/castext2/block.interface.php

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

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

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

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

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

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

stack/cas/castext2/blocks/root.specialblock.php

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

stack/cas/keyval.class.php

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

stack/maximaparser/utils.php

stack/prt.class.php