Code tidy.

locallib.php

questiontype.php

stack/cas/castext2/CTP_classes.php

stack/cas/castext2/block.factory.php

stack/cas/castext2/block.interface.php

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

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

stack/cas/castext2/utils.php

stack/cas/keyval.class.php

stack/cas/parsingrules/601_castext.filter.php

stack/cas/parsingrules/602_castext_simplifier.filter.php

stack/cas/parsingrules/680_gcl_sconcat.filter.php

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

tests/castext2_test.php