align checkbox in list;
it's not so easy, so many unexpected behavior and experiment; it works
at least now :)
CallTheRoll: add a button "Call";
no event handler yet;
add function: when user click an list item, the text of the "call"
button will become "call: somebody", then user can click the button to
call him;
fix a bug: exception when i switch back to CallTheRollTab;
cause: i new SMSReceiver at a improper timing, and i register A and try
to unregister B, not matches, so exception arise;
fix a UI related bug: when i switch from tab CallTheRoll and back, the
list is not shown, the status text is reset to the very initial status,
and the "start/stop" button text is reset and wrong;

cause: onCreateView() and onActivityCreated() called every time i switch
back, and the code in these two functions lead to such appearance;

solution: update list, status textView and button text in
onActivityCreated();
the binary modification is annoying, commit them to clear the long
"Files" list;