Merge branch 't/web_improvements'

Merge branch 't/web_improvements'

The new pages have been tested on slnx with no problems, so they're
ready for prime time.

	329719 web: Move menu down a bit.
	c6ac6c web: Make image rule global.
	c53634 Replace main page by NEWS.
	3c2dfc NEWS: Replace "to be announced" text.
	c2ea0c web: Add tarball and signature link of recent release to NEWS.
	b35afc web: Adjust sizes of monospace fonts.
	7fb28a web: Avoid gray area on gitweb page.
	f3f978 web: Move important parts of the style sheet to the top of the file.
	57058e web: Remove some duplicate rules in para.css.
	5005fb web: Combine the two .css files.
	d74c89 web: Add header to gitweb and API reference sites.
	076b70 web: Increase size of log messages and diffs.
	0384fd web: Unify link colors.
	893669 web: Fix gitweb link on doxygen pages.
	607d79 web: Unify <br> elements.
	40ceca web: Remove valign tag in header files.
	37bfc1 web: Further unify header.html, header2.html and gitweb_header.html.
	197add web: Unify css rules for tables.
	21422a web: Remove horizontal line at the top of the page.
	53963d web: Remove style element in html.
	4c061d web: Make the body selector of the two css files consistent.
	f9fadc web: Use lower-case css selectors.
	22fb31 web: Increase font size.
	2f201d web: css whitespace fixes.
	51445c web: Remove commented-out sections of css files.
	71d445 web: Remove border="0" tag.
	02c1a5 web: Don't set border, cellpadding and cellspacing.
	6e0b01 web: Remove basefont tag.
	42a4cd Update README.
	2210c6 web: Remove explanation of the paraslash acronym.