* [GV_FILE,SC] Added convert_gv/4 to the public predicates.
* [LATEX_EXT,NEW] Added bibtex_convert_file/1.
* [LATEX_EXT,SC] Renamed latex_convert/[1,2] to latex_convert_file[1,2].
* [LATEX_EXT,SC] Placed process creation in a helper predicate that is used by both LaTeX and BibTeX.