Add a helpful macro to fix problematic file names

Some file names pose problems unexpected by users, e.g. when recording
the image sequence import of files whose names contain a closing
bracket. This bracket is misinterpreted by the ImageJ 1.x macro language
as indicating the end of the value, resulting in incomplete paths, and
as a consequence no image is loaded at all when running the recorded
macro.

This macro works around that design flaw by renaming the files with
problematic names.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Add another macro demonstrating the danger of trusting scientists' eyes

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>