* Consider that a filename extension starting with the character '.' or the character '+' is valid.
* Issue #19: add new filename extensions to the translator that are supporting embedded TeX or Beamer layers.
* Add missed GNU plot filename extension: '.gnu'
* Issue #19: AutoLaTeX detects the translator, which is supporting the biggest filename extension of the picture.
* Add the CLI command "showimagemap" for output the translator selected for each detected figure.