- update to 2021:
* implement listings package
* support for \hyperref (hyperref.sty and html.sty syntax)
* \multirow with automatic width (*)
* support for length units em and ex in &convert_length
* support for font-, page- and minipage-relative length units
* support for specifying image size in wrapfigure
* support for commands: \; \, \quad \qquad inside \textsc
* \itemize[], \enumerate[], \description[] (discard argument)
* &convert_to_unicode in style ” for chars > 255
* correct several special symbols for koi8-r encoding
* repair \htmladdimg and user scaling in \includegraphics
* repair scaling for undefined environments in use_dvipng mode
* correct placement of the $\degree$ symbol in use_dvipng mode
* repair scaling in nouse_dvipng mode
* 256-color gif dithering via png16m followed by ppmquant
* correct transparent color specification (for the $\_$ symbol)
* correct Makefile for building manual
* adjust spacing for eqnarray
* fix alignment of eq numbers for safari
* fix infinite loop on empty itemize env
* make link to correct bibliography if there is more than one
* "References" by default, "Bibliography" for book