Restore active part of error page stylesheets

This now uses an adjusted form of errorTryLoadText() which accepts
an absoute path page name and NULL dir instead of errorLoadText()
which is intended only for locating a specific page amongst the error
directory content.

diff --cc errors/Makefile.am
index 6c53194645271369b5d616a28118939723d1148a,79839d25aa6e28f01b559ad1b0acb6d997926351..0aeaa4cf15a5f060d6d7c7e4864f766c6a27e8ad
--- 1/errors/Makefile.am
--- 2/errors/Makefile.am
+++ b/errors/Makefile.am
@@@ -70,7 -72,15 +72,15 @@@ install-data-local
                        $(INSTALL_DATA) $$f $(DESTDIR)$(DEFAULT_ERROR_DIR)/$$l; \
                done; \
          fi \
-       done
+       done; \
 -        $(INSTALL_DATA) $(srcdir)/errorpage.css $(DEFAULT_STYLESHEET).default; \
 -        @if test -f $(DEFAULT_STYLESHEET) ; then \
 -                echo "$@ will not overwrite existing $(DEFAULT_STYLESHEET)" ; \
++        $(INSTALL_DATA) $(srcdir)/errorpage.css $(DESTDIR)$(DEFAULT_STYLESHEET).default; \
++        @if test -f $(DESTDIR)$(DEFAULT_STYLESHEET) ; then \
++                echo "$@ will not overwrite existing $(DESTDIR)$(DEFAULT_STYLESHEET)" ; \
+         else \
 -                echo "$(INSTALL_DATA) $(srcdir)/errorpage.css $(DEFAULT_STYLESHEET)"; \
 -                $(INSTALL_DATA) $(srcdir)/errorpage.css $(DEFAULT_STYLESHEET); \
++                echo "$(INSTALL_DATA) $(srcdir)/errorpage.css $(DESTDIR)$(DEFAULT_STYLESHEET)"; \
++                $(INSTALL_DATA) $(srcdir)/errorpage.css $(DESTDIR)$(DEFAULT_STYLESHEET); \
+         fi
+ 
  
  uninstall-local:
        @ for l in $(LANGUAGES); do \
@@@ -84,7 -94,8 +94,8 @@@
                        rm -f $(DESTDIR)$(DEFAULT_ERROR_DIR)/$$l/`basename $$f`; \
                done; \
          fi \
-       done
+       done; \
 -      rm -f $(DEFAULT_STYLESHEET).default
++      rm -f $(DESTDIR)$(DEFAULT_STYLESHEET).default
  
  # undocumented hack.  You can use this target to create multi-lingual
  # error pages.  For example: