Effect of 4-(5-Chloro-2-hydroxyphenyl)-3-(2-hydroxyethyl)-6-(trifluoromethyl)-quinolin-2(1H)-one (BMS-223131), a Novel Opener of Large Conductance Ca^2^+-Activated K^+ (Maxi-K) Channels on Normal and Stress-Aggravated Colonic Motility and Visceral Nociception