changes regarding fs.py

changes regarding fs.py

1) rearrange the options to be in a nice logical order
2) add an option for what i call "standard switch", which is from simple->timing->detailed
3) change the client/server naming system to testsys/drivesys
4) make checkpointing code such that checkpoints taken from the command line override checkpoint instructions compiled into binaries.
5) add an option for maximum number of checkpoints - simulation will stop at max or maxtick, whichever is first

doesn't fully work because of a caching issue, but the python side of things i think should work - the counterpart of se.py does work.
i think i should factor out a lot of the common code in both, but i'll do that after this checkin, just to get this in the tree.

configs/example/fs.py:
    1) rearrange the options to be in a nice logical order
    2) add an option for what i call "standard switch", which is from simple->timing->detailed
    3) change the client/server naming system to testsys/drivesys
    4) make checkpointing code such that checkpoints taken from the command line override checkpoint instructions compiled into binaries.
    5) add an option for maximum number of checkpoints - simulation will stop at max or maxtick, whichever is first

--HG--
extra : convert_revision : 078e22800ff83f6e950bf5cc6fb16a98320e7c51