make some Capacitor tidbits static

to make them easier to use from other classes
InfiniteCapacitor that never runs out of energy

uses constants from Capacitor, runs at constant voltage, accumulates energy
while spending time in different power modes
netbeans project
fix classpath for NetBeans
mspgcc 4.x friendly -mmcu argument
add abstract PowerSupply class

Abstract away the stuff the Capacitor class was trying to do -- other kinds of
power supplies are possible too.