Added simplified aliases for answer types, as proposed by Thomas Robb. It is now possible to use these aliases:

SHORTANSWER = SA = MW ;
NUMERICAL = NM ;
MULTICHOICE = MC

mod/quiz/format/multianswer.php

@@ -46,7 +46,7 @@ define("NUMERICAL_ABS_ERROR_MARGIN", 6);
 
 // Remaining ANSWER regexes
 define("ANSWER_TYPE_DEF_REGEX",
-       '(NUMERICAL)|(MULTICHOICE)|(SHORTANSWER)');
+       '(NUMERICAL|NM)|(MULTICHOICE|MC)|(SHORTANSWER|SA|MW)');
 define("ANSWER_START_REGEX",
        '\{([0-9]*):(' . ANSWER_TYPE_DEF_REGEX . '):');