new debug mechanism?

[eliotmcintire]

A possible option:
re-Add debug slot to simList
Remove debug argument from doSim
re-Add accessor simDebug methods
use simDebug(sim) for all messages

[achubaty]

the debug flag is in the spades() call not in the simList object since it's a property of the simulation execution not the sim object itself.

use case for including it with the sim ojbect? is the idea that debug will carry through into modules' code?

[achubaty]

commit 22c73f2 adds new option spades.nCompleted
 to set the number of completed events printed when debug=FALSE; default 10