add LICENSE and COPYING; fix workaround for plantuml

scripts/ax_init_standard_project.m4

@@ -7,7 +7,7 @@
 m4_define([mrw_esyscmd_s], [m4_normalize(m4_esyscmd([$1]))])
 
 # define least version number from subversion's revision number:
-# it is taken modulo 256 due to a bug on Apple's MacOSX
+# it is taken modulo 256 due to a bug on Apple's SX
 m4_define(x_least, m4_ifdef([x_least_fix], [x_least_fix],
   m4_ifdef([x_least_diff],
     mrw_esyscmd_s([
@@ -191,6 +191,11 @@ AC_DEFUN([AX_INIT_STANDARD_PROJECT], [
   _AM_SUBST_NOTMAKE([README_HTML])
   AX_SUBST(DESCRIPTION)
   _AM_SUBST_NOTMAKE([DESCRIPTION])
+  LICENSE=$(echo $(head -1 COPYING))
+  AX_SUBST(LICENSE)
+  COPYING=$(<COPYING)
+  AX_SUBST(COPYING)
+  _AM_SUBST_NOTMAKE([COPYING])
   AUTHOR=$(head -1 AUTHORS)
   AUTHOR_NAME=$(echo $AUTHOR | sed 's, *[[<(]].*$,,')
   AUTHOR_URL=$(echo $AUTHOR | sed 's,.*(\(http[[^)]]*\)).*,\1,')
@@ -593,7 +598,8 @@ doc: doxyfile @NEED_PLANTUML_TRUE@ gen-uml-images
 @NEED_PLANTUML_TRUE@	done
 
 clean-documentation:
-	-rm doxygen.errors @PDF_DOC@ @NEED_PLANTUML_TRUE@ gen-uml-images
+	-rm doxygen.errors @PDF_DOC@
+	@NEED_PLANTUML_TRUE@ -rm -rf gen-uml-images
 distclean-documentation:
 	-rm -r html
 	-rm  @PACKAGE_NAME@.doxytag