+20180512
+ + remove trailing ';' from GCC_DEPRECATED definition.
+ + repair a change from 20110730 which left an error-check/warning dead.
+ + fix several minor Coverity warnings.
+
+20180505
+ + add deprecation warnings for internal functions called by older
+ versions of tack.
+ + fix a special case in PutAttrChar() where a cell is marked as
+ alternate-character set, but the terminal does not actually support
+ the given graphic character. This would happen in an older terminal
+ such as vt52, which lacks most line-drawing capability.
+ + use configure --with-config-suffix option to work around filename
+ conflict with Debian packages versus test-packages.
+ + update tracemunch to work with perl 5.26.2, which changed the rules
+ for escaping regular expressions.
+
+20180428
+ + document new form-extension O_EDGE_INSERT_STAY (report by Leon
+ Winter).
+ + correct error-returns listed in manual pages for a few form functions
+ (report by Leon Winter).
+ + add a check in form-library for null-pointer dereference:
+ unfocus_current_field (form);
+ form_driver (form, REQ_VALIDATION);
+ (patch by Leon Winter).
+
+20180414
+ + modify form library to optionally delay cursor movement on a field
+ edge/boundary (patch by Leon Winter).
+ + modify form library to avoid unnecessary update of cursor position in
+ non-public fields (patch by Leon Winter).
+ + remove unused _nc_import_termtype2() function.
+ + also add/improve null-pointer checks in other places
+ + add a null-pointer check in _nc_parse_entry to handle an error when
+ a use-name is invalid syntax (report by Chung-Yi Lin).
+