By Nancy Spiller Alec Egan's painting "Dawn House," in his show "Groundskeeper" at Vielmetter Los Angeles, is tender, serene, and calm — a lavender and peach sky sheltering the triangular top of a house flanked by two palm trees and the tip of a cypress. In its companion painting, "Night House," the sky takes a sinister turn with layers of dark blue, sunset orange, and a roiling strip indicative of flames mixed with what might be smoke. It hints at something of what Egan, his