filtering, take the intersection rather than the union (so ?B picks
blessed scrolls rather than all scrolls plus blessed everything)
bmask is stored with the objects on the Plane of Water to prevent segfault
+engraving on drawbridge with wand of digging should produce appropriate
+ message instead of referring to gravel
Platform- and/or Interface-Specific Fixes
win32gui: support for saving/restoring message history
win32gui: added menu options "Copy ASCII Screenshot To Clipboard" and "Save
ASCII Screenshot To File"
+win32gui, win32tty: add support for looking for sysconf in %COMMONPROGRAMFILES%
+ first and for user config file in %USERPROFILE% (improves support for
+ multi-login Windows environments)
win32tty: support for 'selectsaved' option for menu of existing save files
to choose from at game startup
tty: add window port routines for saving/restoring message history