Change final_dims_fake back after reoder array because if retrieve = F, it will be used in attributes later

Move adjusted split dim order part to after 'Detect dimension' print. Then reorder dimension back to the user-required order after getting array.

Add new parameter 'merge_across_dims_narm' and develop codes for the case 'merge_across_dims_narm = TRUE'.

Bugfix for longitude selectors across border case. The indices were chosen one more in SelectorCheckor. Fix in Start after calling SelectorCheckor.

Bugfix for lat/lon read-in when assigned by values() in Start(). It was incorrect when the values are from big to small.