ExcelWriter: Added option to prepend header row with column names
ExcelWriter: Added option to prepend header row with column names

ddeboer/data-import,intrepion/data-import,gnat42/data-import,Muoversi/data-import,smilesrg/data-import,potherca-contrib/data-import,Edouard-chin/data-import,portphp/portphp,seydu/data-import,mikifus/data-import,potherca/data-import,MjAbuz/data-import,ptorti/data-import