Fixed an undefined 'that' variable error.
Fixed an undefined 'that' variable error.

I had forgotten to keep a reference to the main plugin object.
The reference on save_datasource is now called 'this_p'.
All references to 'that' have been updated.
newenter/saiku,customme/saiku,bisone/saiku,zegang/saiku,NAUMEN-GP/saiku,standino/saiku,OSBI/saiku-ui,devgateway/ccrs-saiku,dasbh/saiku,devgateway/ccrs-saiku,wwf830527/saiku,qixiaobo/saiku-self,NAUMEN-GP/saiku,qqming113/saiku,zegang/saiku,standino/saiku,OSBI/saiku,qixiaobo/saiku-self,customme/saiku,dasbh/saiku,hengyuan/saiku,wtstengshen/saiku,standino/saiku,dasbh/saiku,witcxc/saiku,bisone/saiku,wtstengshen/saiku,qqming113/saiku,wwf830527/saiku,standino/saiku,zegang/saiku,brenopolanski/saiku-ui,qqming113/saiku,qqming113/saiku,dasbh/saiku,standino/saiku,witcxc/saiku,standino/saiku,devgateway/ccrs-saiku,witcxc/saiku,wtstengshen/saiku,newenter/saiku,hengyuan/saiku,hengyuan/saiku,brenopolanski/saiku-ui,OSBI/saiku-ui,wtstengshen/saiku,qixiaobo/saiku-self,wtstengshen/saiku,newenter/saiku,hengyuan/saiku,wwf830527/saiku,NAUMEN-GP/saiku,bisone/saiku,NAUMEN-GP/saiku,qqming113/saiku,bisone/saiku,devgateway/ccrs-saiku,OSBI/saiku,customme/saiku,bisone/saiku,wwf830527/saiku,zegang/saiku,OSBI/saiku,wtstengshen/saiku,qqming113/saiku,devgateway/ccrs-saiku,OSBI/saiku,bisone/saiku,dasbh/saiku,devgateway/ccrs-saiku,zegang/saiku,newenter/saiku,qixiaobo/saiku-self,OSBI/saiku,NAUMEN-GP/saiku,customme/saiku,wwf830527/saiku,dasbh/saiku,zegang/saiku