Fix for pull request #80 bad JML opcode and adding syntax for Absolute Indirect Long

Fix for pull request https://github.com/oliverschmidt/cc65/pull/80

* Fixing bad JML opcode for "Absolute Indirect Long" adressing mode
* adding `jml ($1234)` syntax for "Absolute Indirect Long" adressing mode instead of just supporting `jml [$1234]`