Debug messages in mod_charset_lite are now controlled by

CharsetOptions DebugLevel=n instead of CharsetDebug on/off.  Use the debug
level to decide which debug messages to issue (if any).  Use ap_log_rerror()
instead of ap_log_error() when appropriate.
Describe CharsetOptions in the doc.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86338 13f79535-47bb-0310-9956-ffa450edef68