use regular Term.add_vars, Term.add_frees etc.;
moved old add_term_vars, add_term_frees etc. to structure OldTerm;
syntax: glob
*~
*.class
*.jar
.DS_Store
syntax: regexp
^heaps/
^browser_info/
^doc-src/.*\.aux
^doc-src/.*\.bbl
^doc-src/.*\.blg
^doc-src/.*\.dvi
^doc-src/.*\.idx
^doc-src/.*\.ind
^doc-src/.*\.log
^doc-src/.*\.out
^doc-src/.*\.rai
^doc-src/.*\.rao
^doc-src/.*\.toc