ASX gains on materials, real estate sector upgrades, Ramsay goes back to basics The S&P/ASX200 (ASX: XJO) managed another strong opening, gaining 0.4 per cent on Monday, ahead of the summer holiday slowdown that typically occurs. The energy, mining and real estate sectors were the biggest contributors to the rally with Charter Hall (ASX: CHC) gaining 5.6 per cent, BHP (ASX: BHP) 2.7 per…