Middle-click the clock to execute tasks

Add something like the following to tint2rc :-
clock_mclick_command = /path/to/program

This is David B. Cortarello's patch minus the zombie tasks element,
plus a change to tint.c to make things work properly.

https://code.google.com/p/tint2/issues/detail?id=430
Added left & right click support for battery panel

Add something like the following to tint2rc :-

battery_lclick_command = /path/to/program
battery_rclick_command = /path/to/program
Added middle-click support to the battery panel

Add something like the following to tint2rc :-

battery_mclick_command = /path/to/program