for network process.
(socket_options): Add `:' prefix to option names. Add optbit field.
(set_socket_option): Remove no_error arg and special handling of s < 0.
Return 1<<optbit for known option, 0 for unknown.
Do not interpret 0 as false for boolean option (only nil).
Pass failed option and value to report_file_error.
(Fset_network_process_options): Replaced by Fset_network_process_option.
(Fset_network_process_option): New function to set just one option.
(Fmake_network_process): Allow :coding arg to be a cons.
Allow :server arg to be an integer specifying backlog size.
Remove :options arg, and allow options to be specified directly
as :KEY, VALUE pairs. Parse these options before binding socket.
As before, :reuseaddr t is default for a server process, but this
can now be disabled by specifying :reuseaddr nil.
(Fnetwork_interface_info): Rename from Fget_network_interface_info.
(init_process): Availability of network options is now checked with
simpler syntax (featurep 'make-network-process :OPTION); use loop to
setup features.
(syms_of_process): Fix defsubr's for the replaced functions.
(recentf-exclude): Accept predicates too.
(recentf-file-readable-p): New function.
(recentf-include-p): Handle predicates in recentf-exclude.
(recentf-add-file): Doc fix. Use recentf-file-readable-p.
(recentf-cleanup): Likewise.
(recentf-save-list): Use write-file to handle backup of recentf-save-file.
(union Lisp_Object): Use unsigned int for types. Remove markbit.
(MARKBIT): Remove 1 from VALBITS so we still use same old val.
(XTYPE): Use unsigned right-shift.
(XMARKBIT, XMARK, XUNMARK): Remove.
Update Commentary and Copyright.
(battery-linux-proc-acpi): Fix a bug in %b which made "!" never
appear due to wrong ordering of the expressions in `or'.
(recentf-menu-path,recentf-menu-before): Doc fix.
(recentf-menu-bar): New function.
(recentf-clear-data): Use it
(recentf-update-menu): Likewise. Use easy-menu-add-item instead
of easy-menu-change.
