- add example to README to extract gitweb.owner from a git config.
this is used in gitweb and some cgit configurations.
- fix (new) mandoc warnings (new sentence on each line).
- improve some texts in the man pages, sort / structure some list items.
"Optionally the -c cachefile option can be used to cache the entries of
the log page up to the point of the last commit. The cachefile will store
the last commit id and the entries in the HTML table."
this caches the diffstat and commits, it is an expensive operation (twss).
