1.去除无用代码
2.实现Variant的所有operator


git-svn-id: http://qlanguage.googlecode.com/svn/trunk@312 6d982bb3-a5a7-393d-ffc5-582415be9c85
实现instructions的打印代码


git-svn-id: http://qlanguage.googlecode.com/svn/trunk@313 6d982bb3-a5a7-393d-ffc5-582415be9c85