2.11: Bug fix in parsing; a dozen small repairs
2.10: nountangle becomes a filter; multilanguage support; ...
2.9:  Support for hyperref; many small repairs
2.8:  LaTeX2e, support for HTML tables
2.7:  Reads nuweb files, converts latex to HTML
2.6:  HTML support, necessitating a rewrite of cross-referencer
2.5:  Index of identifiers and identifier cross-reference
2.4:  Icon versions of the major pipeline stages
2.0:  Fully detailed pipeline representation
1:    Pipelined architecture
0:    Monolithic notangle; noweave as unholy awk script
