+20200104
+ + modify a couple of macros in aclocal.m4 to allow autoconf 2.69 to
+ "work", to help illustrate discussion in
+ https://invisible-island.net/autoconf/my-autoconf.html
+ + fix some warnings from autoheader-252
+
+20191228
+ + in gen-pkgconfig.in, move the RPATH_LIST and PRIVATE_LIBS assignments
+ past the various prefix/libdir assignments, to allow for using those
+ symbols, e.g., as done via CF_SHARED_OPTS.
+ + improve ncurses*-config and pc-files by filtering out linker-specs.
+ + modify test-package to more closely match Fedora's configuration
+ for PIE/PIC feature and debug-packages.
+
+20191221
+ + correct pathname used in Ada95 sample programs for explain.txt, to
+ work with test-packages.
+ + improve tracemunch:
+ + keep track of TERMINAL* values
+ + if tracing was first turned on after initialization, attempt to
+ show distinct screen, window and terminal names anyway.
+ + ensure that GCC_NORETURN is defined in term.h, because the prototype
+ for exit_terminfo() uses it (report by Werner Fink).
+
+20191214
+ + add exit_curses() and exit_terminfo() to replace internal symbols for
+ leak-checking.
+
+20191207
+ + fix a few warnings for test-package builds
+ + add curses_trace(), to replace trace().
+