Enable pending flexibility tests by changing the slider inputs (e.g., 10.0 is greater than the max (= 8.2) of the number_of_industry_other_paper_flexibility_p2h_electricityslider)
Enable pending test for LNG
Remove pending costs tests for cars since these have zero costs (nor corresponding queries)
Fixes https://github.com/quintel/mechanical_turk/issues/100:
number_of_industry_other_paper_flexibility_p2h_electricityslider)