small typo pointed out by Mike Hommey slightly improved the --c14n

* xmlIO.c: small typo pointed out by Mike Hommey
* doc/xmllint.xml, xmllint.html, xmllint.1: slightly improved
  the --c14n description, c.f. #144675 .
* nanohttp.c nanoftp.c: applied a first simple patch from
  Mike Hommey for $no_proxy, c.f. #133470
* parserInternals.c include/libxml/parserInternals.h
  include/libxml/xmlerror.h: cleanup to avoid 'error' identifier
  in includes #
* parser.c SAX2.c debugXML.c include/libxml/parser.h:
  first version of the inplementation of parsing within
  the context of a node in the tree #142359, new function
  xmlParseInNodeContext(), added support at the xmllint --shell
  level as the "set" function
* test/scripts/set* result/scripts/* Makefile.am: extended
  the script based regression tests to instrument the new function.
Daniel
diff --git a/nanoftp.c b/nanoftp.c
index a2ecc40..7fe2095 100644
--- a/nanoftp.c
+++ b/nanoftp.c
@@ -195,7 +195,7 @@
 
     proxyPort = 21;
     env = getenv("no_proxy");
-    if (env != NULL)
+    if (env && ((env[0] == '*' ) && (env[1] == 0)))
 	return;
     env = getenv("ftp_proxy");
     if (env != NULL) {