some cleanup checking for xmllint and xsltproc in configure.in, fixed make

* configure.in doc/Makefile.am xstc/Makefile.am: some cleanup
  checking for xmllint and xsltproc in configure.in, fixed
  make dist w.r.t. the new xstc subdir.
* doc/*: rebuilt
Daniel
diff --git a/doc/APIsymbols.html b/doc/APIsymbols.html
index 813c48a..682e9b8 100644
--- a/doc/APIsymbols.html
+++ b/doc/APIsymbols.html
@@ -771,6 +771,8 @@
 <a href="html/libxml-xmlerror.html#XML_SCHEMAP_INVALID_MINOCCURS">XML_SCHEMAP_INVALID_MINOCCURS</a><br />
 <a href="html/libxml-xmlerror.html#XML_SCHEMAP_INVALID_REF_AND_SUBTYPE">XML_SCHEMAP_INVALID_REF_AND_SUBTYPE</a><br />
 <a href="html/libxml-xmlerror.html#XML_SCHEMAP_INVALID_WHITE_SPACE">XML_SCHEMAP_INVALID_WHITE_SPACE</a><br />
+<a href="html/libxml-xmlerror.html#XML_SCHEMAP_MG_PROPS_CORRECT_1">XML_SCHEMAP_MG_PROPS_CORRECT_1</a><br />
+<a href="html/libxml-xmlerror.html#XML_SCHEMAP_MG_PROPS_CORRECT_2">XML_SCHEMAP_MG_PROPS_CORRECT_2</a><br />
 <a href="html/libxml-xmlerror.html#XML_SCHEMAP_MISSING_SIMPLETYPE_CHILD">XML_SCHEMAP_MISSING_SIMPLETYPE_CHILD</a><br />
 <a href="html/libxml-xmlerror.html#XML_SCHEMAP_NOATTR_NOREF">XML_SCHEMAP_NOATTR_NOREF</a><br />
 <a href="html/libxml-xmlerror.html#XML_SCHEMAP_NOROOT">XML_SCHEMAP_NOROOT</a><br />
@@ -807,6 +809,9 @@
 <a href="html/libxml-xmlerror.html#XML_SCHEMAP_SRC_ATTRIBUTE_3_1">XML_SCHEMAP_SRC_ATTRIBUTE_3_1</a><br />
 <a href="html/libxml-xmlerror.html#XML_SCHEMAP_SRC_ATTRIBUTE_3_2">XML_SCHEMAP_SRC_ATTRIBUTE_3_2</a><br />
 <a href="html/libxml-xmlerror.html#XML_SCHEMAP_SRC_ATTRIBUTE_4">XML_SCHEMAP_SRC_ATTRIBUTE_4</a><br />
+<a href="html/libxml-xmlerror.html#XML_SCHEMAP_SRC_ATTRIBUTE_GROUP_1">XML_SCHEMAP_SRC_ATTRIBUTE_GROUP_1</a><br />
+<a href="html/libxml-xmlerror.html#XML_SCHEMAP_SRC_ATTRIBUTE_GROUP_2">XML_SCHEMAP_SRC_ATTRIBUTE_GROUP_2</a><br />
+<a href="html/libxml-xmlerror.html#XML_SCHEMAP_SRC_ATTRIBUTE_GROUP_3">XML_SCHEMAP_SRC_ATTRIBUTE_GROUP_3</a><br />
 <a href="html/libxml-xmlerror.html#XML_SCHEMAP_SRC_ELEMENT_1">XML_SCHEMAP_SRC_ELEMENT_1</a><br />
 <a href="html/libxml-xmlerror.html#XML_SCHEMAP_SRC_ELEMENT_2_1">XML_SCHEMAP_SRC_ELEMENT_2_1</a><br />
 <a href="html/libxml-xmlerror.html#XML_SCHEMAP_SRC_ELEMENT_2_2">XML_SCHEMAP_SRC_ELEMENT_2_2</a><br />
@@ -873,6 +878,7 @@
 <a href="html/libxml-schemasInternals.html#XML_SCHEMAS_ANY_SKIP">XML_SCHEMAS_ANY_SKIP</a><br />
 <a href="html/libxml-schemasInternals.html#XML_SCHEMAS_ANY_STRICT">XML_SCHEMAS_ANY_STRICT</a><br />
 <a href="html/libxml-schemasInternals.html#XML_SCHEMAS_ATTRGROUP_GLOBAL">XML_SCHEMAS_ATTRGROUP_GLOBAL</a><br />
+<a href="html/libxml-schemasInternals.html#XML_SCHEMAS_ATTRGROUP_MARKED">XML_SCHEMAS_ATTRGROUP_MARKED</a><br />
 <a href="html/libxml-schemasInternals.html#XML_SCHEMAS_ATTRGROUP_WILDCARD_BUILDED">XML_SCHEMAS_ATTRGROUP_WILDCARD_BUILDED</a><br />
 <a href="html/libxml-schemasInternals.html#XML_SCHEMAS_ATTR_FIXED">XML_SCHEMAS_ATTR_FIXED</a><br />
 <a href="html/libxml-schemasInternals.html#XML_SCHEMAS_ATTR_GLOBAL">XML_SCHEMAS_ATTR_GLOBAL</a><br />
@@ -986,6 +992,7 @@
 <a href="html/libxml-schemasInternals.html#XML_SCHEMAS_TYPE_FINAL_RESTRICTION">XML_SCHEMAS_TYPE_FINAL_RESTRICTION</a><br />
 <a href="html/libxml-schemasInternals.html#XML_SCHEMAS_TYPE_FINAL_UNION">XML_SCHEMAS_TYPE_FINAL_UNION</a><br />
 <a href="html/libxml-schemasInternals.html#XML_SCHEMAS_TYPE_GLOBAL">XML_SCHEMAS_TYPE_GLOBAL</a><br />
+<a href="html/libxml-schemasInternals.html#XML_SCHEMAS_TYPE_MARKED">XML_SCHEMAS_TYPE_MARKED</a><br />
 <a href="html/libxml-schemasInternals.html#XML_SCHEMAS_TYPE_MIXED">XML_SCHEMAS_TYPE_MIXED</a><br />
 <a href="html/libxml-schemasInternals.html#XML_SCHEMAS_TYPE_OWNED_ATTR_WILDCARD">XML_SCHEMAS_TYPE_OWNED_ATTR_WILDCARD</a><br />
 <a href="html/libxml-schemasInternals.html#XML_SCHEMAS_TYPE_VARIETY_ABSENT">XML_SCHEMAS_TYPE_VARIETY_ABSENT</a><br />