Revert "Use Point::add"
Revert "Use Point::add"

This reverts commit 1d0312e48b0f97bb0f6244c81ffda47402d8eb9a.

atom/text-buffer,atom/text-buffer,jacekkopecky/text-buffer,jacekkopecky/text-buffer,mizchi-sandbox/standalone-atom-editor,mizchi-sandbox/standalone-atom-editor,pombredanne/text-buffer,pombredanne/text-buffer,whodatninja/text-buffer