Put a label next to embedded images.
When the extension of a file is unrecognised, look at the first
line of the file to guess whether it is text or binary; if it
looks binary, emit a link, instead of dumping out the whole file.
instead of just "htmlhead" and "htmltail" there are now:
"sourcehead" and "sourcetail"
"sourcedirhead" and "sourcedirtail"
"findhead" and "findtail"
"identhead" and "identtail"
"searchhead" and "searchtail"
so that each CGI can have its own custom headers and footers.
If (for example) identhead isn't configured in lxr.conf, then
htmlhead will be used instead.
"sourcedir*" is used in preference to "source*" when the output
of the "source" script is a CGI. If sourcedir* aren't configured,
then it falls back to "source*" (and from there to "html*")