stddoclet: Combine -docencoding and -charset options

Name: dk30142 Date: 10/02/2002

The standard doclet currently has two separate but related options:
-charset and -docencoding, which, if they both take values, should
take the same value. The -docencoding option tells the standard doclet
which encoding to use when writing the HTML files. The -charset option
independently creates the following META tag which identifies the encoding
used when reading the HTML files:

  <META http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">

To play things safe, the charset should really be derived from the
character encoding named in the -docencoding option (or the default used
if this option isn't given), in the manner described in my evaluation.
Letting the caller specify -charset and -docencoding separately just
opens the door to inconsistent settings. Can we remove the -charset
option? Or just provide an option to turn off the charset specification?

This RFE was inspired by this RFE:
4753019 : "No character encoding detected" warning from HTML validator