- don't use references to entity pointers in the semi-implicit models
anymore. this caused the element pointer to go out of scope and made
it dangle. It was just pure luck that it (mostly) worked anyway.
- fix the non-isothermal navier-stokes model
- reduce the default value for the final time of the water-air problem
to 5000 seconds. this should avoid time-out problems on slower
machines (nalle, I'm looking at you)
- reduce the final time for the reservoir problem to 100 seconds to avoid
numeric errors from accumulating too much.
- don't complain about saturation differences less than .1% anymore
- make the fix for the end time detection work for negative end times
- reduce the total time the stokes problem is run to 10 seconds. this
is probably not a real fix, but the navier-stokes model does not
work nicely yet anyway...
- do not compare floating point values with the '==' operator in the
immiscible flash constraint solver.
