Merge branch 'jk/http-errors'

Propagate the error messages from the webserver better to the
client coming over the HTTP transport.

* jk/http-errors:
  http: default text charset to iso-8859-1
  remote-curl: reencode http error messages
  strbuf: add strbuf_reencode helper
  http: optionally extract charset parameter from content-type
  http: extract type/subtype portion of content-type
  t5550: test display of remote http error messages
  t/lib-httpd: use write_script to copy CGI scripts
  test-lib: preserve GIT_CURL_VERBOSE from the environment

Documentation/technical/api-strbuf.txt

@@ -134,6 +134,11 @@ Functions
 
 	Strip whitespace from the beginning of a string.
 
+`strbuf_reencode`::
+
+	Replace the contents of the strbuf with a reencoded form.  Returns -1
+	on error, 0 on success.
+
 `strbuf_tolower`::
 
 	Lowercase each character in the buffer using `tolower`.