add get program current path function

1.add get program current path function ,can run andbug in any path ,and doesn't need to change the relatetion path.
2.fix the log path is in the andbug python file path.
3.found the break-datail funciton can't get the argument and various of funciton when the apk is processed by proGuard tool,because the jdwp can't get the value from dalvik. I don't know the detail reason.