Functions addded to HistoryManager.
Functions addded to HistoryManager.

AvadootNachankar/gstudio,Dhiru/gstudio,olympian94/gstudio,AvadootNachankar/gstudio,Dhiru/gstudio,olympian94/gstudio,gnowledge/gstudio,makfire/gstudio,gnowledge/gstudio,sunnychaudhari/gstudio,AvadootNachankar/gstudio,supriyasawant/gstudio,supriyasawant/gstudio,Dhiru/gstudio,supriyasawant/gstudio,gnowledge/gstudio,olympian94/gstudio,AvadootNachankar/gstudio,olympian94/gstudio,makfire/gstudio,olympian94/gstudio,sunnychaudhari/gstudio,sunnychaudhari/gstudio,makfire/gstudio,Dhiru/gstudio,sunnychaudhari/gstudio,makfire/gstudio,gnowledge/gstudio,gnowledge/gstudio,supriyasawant/gstudio,olympian94/gstudio