The environment variable DISTREN_CONFIG, the built-in default config file location, or arguments passed on the commandline are used to determine the prefix of the config file name. Order of precedence: The command line is used first, then the environment variable, and then the default if no others sources specify the prefix.

  A calling function must call options_init() before processing its own arguments so that the libdistrencommon-specific help listing may be shown. The caller must also ignore libdistrencommon specific options. To avoid complication, those arguments are "c:h". Obviously, "h" should be handled sspecially ;-) (i.e., the caller should not ignore the "h" switch... it should output information about arguments it supports). Of course, calling functions could just rely on the