Do not install "dummy" CHANGES file.

Do not install the "dummy" CHANGES file from the main directory of the
source tree since it does not contain any useful information (after the
DCMTK has been installed).

CHANGES

@@ -1,12 +1,13 @@
 
 In earlier versions of DCMTK, changes between releases had been documented in a
-CHANGES.XXX file inside DCMTK's main directory.
+CHANGES.XXX file inside DCMTK's main directory, with "XXX" referring to the
+version number of the release.
 
-Now, the CHANGES.XXX file has been moved to the dcmtk/doc folder with the latest
-one being updated every time that a new DCMTK version is released.  Thus it
-always contains all DCMTK changes between the last DCMTK release and the most
-recent one.
+Now, the CHANGES.XXX file has been moved to the dcmtk/docs folder (in the
+source code package) with the latest one being updated every time a new DCMTK
+version is released.  Thus, it always contains all DCMTK changes between the
+previous DCMTK release and the most recent one.
 
 For very recent changes, i. e. those changes to DCMTK that have been applied
-after the most recent release, see the DCMTK git repository log at
-http://git.dcmtk.org/ .
+after the most recent release, see the commit history of DCMTK's git repository
+at https://git.dcmtk.org/.

CMakeLists.txt

@@ -100,7 +100,7 @@ install(FILES "${DCMTK_BINARY_DIR}/config/include/dcmtk/config/osconfig.h"
         COMPONENT include)
 
 # Install DCMTK's general documentation files
-install(FILES ANNOUNCE CHANGES COPYRIGHT CREDITS FAQ HISTORY VERSION
+install(FILES ANNOUNCE COPYRIGHT CREDITS FAQ HISTORY VERSION
         DESTINATION "${CMAKE_INSTALL_DOCDIR}"
         COMPONENT doc)
 install(DIRECTORY docs/ DESTINATION "${CMAKE_INSTALL_DOCDIR}"

Makefile

@@ -45,7 +45,7 @@ check-nosilent-exhaustive:  config-check-exhaustive ofstd-check-exhaustive oflog
 
 dcmtk-install-doc:
 	$(configdir)/mkinstalldirs $(DESTDIR)$(docdir)
-	for file in ANNOUNCE CHANGES COPYRIGHT CREDITS FAQ HISTORY VERSION docs/CHANGES.???; do \
+	for file in ANNOUNCE COPYRIGHT CREDITS FAQ HISTORY VERSION docs/CHANGES.???; do \
 		$(INSTALL_DATA) $$file $(DESTDIR)$(docdir) ;\
 	done
 

config/rootconf

@@ -84,7 +84,7 @@ check-nosilent-exhaustive: $makecheckexhaustive
 
 dcmtk-install-doc:
 	\$(configdir)/mkinstalldirs \$(DESTDIR)\$(docdir)
-	for file in ANNOUNCE CHANGES COPYRIGHT CREDITS FAQ HISTORY VERSION docs/CHANGES.???; do \\
+	for file in ANNOUNCE COPYRIGHT CREDITS FAQ HISTORY VERSION docs/CHANGES.???; do \\
 		\$(INSTALL_DATA) \$\$file \$(DESTDIR)\$(docdir) ;\\
 	done