* lisp/org.el (org-link-escape-chars): Add comment with escape numbers
alphabetically ordered.
(org-link-escape-chars-browser): Add comment with escape numbers.
(org-link-escape): Use better readable char constant instead of number
constant for percent char.
(org-link-escape-browser): New function to substitute duplicate source
code.
(org-open-at-point): Substitute duplicate source code.
* testing/README: Make comment in source code example clearer.
* testing/lisp/test-org.el (test-org/org-link-escape-chars-browser):
Change URL to real use case and use the new function
`org-link-escape-browser'.
testing/README (running batch tests): Added missing paths to the command.
Make sure to load the org-mode code from the git checkout rather than
whatever Org is installed in Emacs directories.
TINYCHANGE