Plain copy-file no longer chmods an existing destination.
* doc/lispref/files.texi (Changing Files): Document this. * etc/NEWS: Document this. * src/fileio.c (realmask): Now a static var, not a local. (barf_or_query_if_file_exists): New arg KNOWN_TO_EXIST. Remove arg STATPTR. All uses changed. (Fcopy_file): Do not alter permissions of existing destinations, unless PRESERVE-PERMISSIONS (renamed from PRESERVE-EXTENDED-ATTRIBUTES) is non-nil. Avoid race when testing for existing destinations and for when input and output files are the same. If changing the group fails, adjust both default and preserved permissions so that access is not granted to the wrong group. (Fset_default_file_modes, init_fileio): Update realmask. (Fdefault_file_modes): Use realmask instead of calling umask. Fixes: debbugs:16133
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