transit_time
actually wanted just the fluid volume for this bit.
vol -> v_ff
adds paramaterizeable xml files for various lumped parameter cases.
adds t_t_ to tests in lumped param
fixes tests
Merge branch 'lumped_base_case' of github.com:katyhuff/cyder into lumped_base_case
fixed cpfm
Merge branch 'lumped_base_case' into develop