Changes to config to allow everything (including 'children'

Changes to config to allow everything (including 'children'
and 'type') to be specified via instance name and not just
config class.  Old code only did instance-name lookup for
SimObject parameters.  This feature makes life easier for
transitioning to the Python script-based config.

sim/builder.cc:
    Use ConfigNode::find to look for "type" parameter so it can
    be found if set under instance name (not config class).
sim/param.cc:
    Make Param<bool> accept "1" for true and "0" for false.

--HG--
extra : convert_revision : f40d0878d0f03b2e216f0506c05d0e52db608cca