[tex4ht] New make4ht version and documentation

[Michal Hoftich]

Hi all,

I've added a new logging mechanism to make4ht. It will hide most
information from the command line output by default, including output
from the executed commands. The loglevel can be selected using the
`-a` option. There are several levels: debug, info, status (default),
warning, error and fatal. The original make4ht behaviour, that prints
lot of information and also stops on errors in the LaTeX compilation
can be requested using the `debug` option:

      make4ht -a debug faulty.tex

Best regards,
Michal