gpgtar: Read common.conf for the log-file option.
* common/util.h (GNUPG_MODULE_NAME_GPGTAR): New. * common/homedir.c (gnupg_module_name): Add it. * tools/gpgtar.c: Include comopt.h. (enum cmd_and_opt_values): Add oDebug. (opts): Add --debug. (any_debug): New. (main): Parse common.conf.
Having a way to see the output of gpgtar is often useful for
debugging. The only effect of the debug option is to show whether
common.conf was read.