* tmac/www.tmac: Replace\\n[www-html] with \n[www-html] since the

* tmac/tmac: Replace\\n[www-html] with \n[www-html] since the
device is already known at start-up.
Make all names of internal macros/registers/strings lowercase, and
prepend `www-'.
Other minor changes.

* src/roff/troff/troff.man: Add preprocessor string at BOF.

Implement option `-b' in grohtml to set the HTML background colour.

* src/devices/grohtml/post-html.cc (default_background): New global
variable.
(html_printer::html_printer): Initialize `background' to
`default_background'.
(main): Implement option `-b'.
(usage): Updated.
* src/preproc/html/pre-html.cc (scanArguments): Add dummy handling
of `-b' option.
* src/devices/grohtml/grohtml.man: Updated.
* doc/Makefile (.ms.html): Use `-b'.
* tmac/html.tmac: Don't set background color.

Add new grohtml tag `.html-tl'.

* src/devices/grohtml/post-html.cc (title_desc): Add `with_h1'
member variable.
(title_desc::title_desc): Updated.
(html_printer::troff_tag): Handle `.html-tl'.
(html_printer::write_title): Use `with_h1'.
* tmac/www.tmac (www-end-nowhere): New auxiliary macro.
(HTML-TL): New macro.

Add support for unordered lists in HTML.

* tmac/www.tmac (www-level): New auxiliary register.
(www-level1, www-level2, www-level3): New auxiliary strings.
(www-push-level, www-pop-level): New auxiliary macros
(UL-BEGIN, UL-END, LI): User macros for unordered lists.

Miscellaneous.

* src/preproc/html/pre-html.cc (DEFAULT_IMAGE_RES): Increase to 100.
(DEFAULT_VERTICAL_OFFSET): Removed.
(IMAGE_BOARDER_PIXELS): Set to 0.
(A4_LENGTH, A4_OFFSET, LETTER_LENGTH, LETTER_OFFSET): New macros.
(vertical_offset): Initialize with 0.
(gsPaper): New global variable.
(get_resolution): Scan for and return unsigned int.
(get_papersize): New function to get paper length from devps/DESC.
(determine_vertical_offset): New function.
(createAllPages): Produce gray-level images and use proper page
length.
(createImage): Use `-quiet' option of pnmcrop.
(addZ): Fix passing of `-Z'.
(scanArguments): Fix handling of `-o'.
(main): Call `determine_vertical_offset'.
* src/devices/grohtml/post-html.cc (html_printer::draw): Comment out
code for `l'.

* src/libs/libgroff/tmpfile.cc (add_tmp_file): Fix buffer length.
* src/roff/troff/node.cc (troff_output_file::check_charinfo): Handle
glyph descenders properly.

* doc/homepage.ms: Include `gnubw.eps'.
* doc/Makefile (gnubw.eps): New rule.
(homepage.html): Depend on `gnubw.eps'.