1.解決某些情況下, Fragment會重疊顯示的問題
2.全面使用transAction.replace
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Merge branch 'master' of https://github.com/ssd863419/Sale

Conflicts:
	app/src/main/java/ssd/sale/Menu_BaoB.java
	app/src/main/java/ssd/sale/Menu_JinH.java
	app/src/main/java/ssd/sale/Menu_PanD.java
	app/src/main/java/ssd/sale/Menu_XiT.java
	app/src/main/java/ssd/sale/Menu_XiaoS.java