Update the make system for installations:

- define a HERE variable to indicate where the source tree is (used
  very little right now)
- make more use of copying and making attribute changes to {file}.new,
  and then move it to {file}
- use 'mv -f' to avoid all those questions to the user when the file
  in question doesn't have write attributes for that user.

apps/Makefile.ssl

diff --git a/apps/Makefile.ssl b/apps/Makefile.ssl
index 1908f8d..7819236 100644
--- a/apps/Makefile.ssl
+++ b/apps/Makefile.ssl
@@ -99,17 +99,20 @@
 	@for i in $(EXE); \
 	do  \
 	(echo installing $$i; \
-	 cp $$i $(INSTALL_PREFIX)$(INSTALLTOP)/bin/$$i; \
-	 chmod 755 $(INSTALL_PREFIX)$(INSTALLTOP)/bin/$$i ); \
+	 cp $$i $(INSTALL_PREFIX)$(INSTALLTOP)/bin/$$i.new; \
+	 chmod 755 $(INSTALL_PREFIX)$(INSTALLTOP)/bin/$$i.new; \
+	 mv -f $(INSTALL_PREFIX)$(INSTALLTOP)/bin/$$i.new $(INSTALL_PREFIX)$(INSTALLTOP)/bin/$$i ); \
 	 done;
 	@for i in $(SCRIPTS); \
 	do  \
 	(echo installing $$i; \
-	 cp $$i $(INSTALL_PREFIX)$(OPENSSLDIR)/misc/$$i; \
-	 chmod 755 $(INSTALL_PREFIX)$(OPENSSLDIR)/misc/$$i ); \
+	 cp $$i $(INSTALL_PREFIX)$(OPENSSLDIR)/misc/$$i.new; \
+	 chmod 755 $(INSTALL_PREFIX)$(OPENSSLDIR)/misc/$$i.new; \
+	 mv -f $(INSTALL_PREFIX)$(INSTALLTOP)/misc/$$i.new $(INSTALL_PREFIX)$(INSTALLTOP)/misc/$$i ); \
 	 done
-	@cp openssl.cnf $(INSTALL_PREFIX)$(OPENSSLDIR); \
-	chmod 644 $(INSTALL_PREFIX)$(OPENSSLDIR)/openssl.cnf
+	@cp openssl.cnf $(INSTALL_PREFIX)$(OPENSSLDIR)/openssl.cnf.new; \
+	chmod 644 $(INSTALL_PREFIX)$(OPENSSLDIR)/openssl.cnf.new; \
+	mv -f  $(INSTALL_PREFIX)$(OPENSSLDIR)/openssl.cnf.new $(INSTALL_PREFIX)$(OPENSSLDIR)/openssl.cnf
 
 tags:
 	ctags $(SRC)