Rip out the code to check the ordering of the tables used to map

Rip out the code to check the ordering of the tables used to map
strings to integers for the *conf*() functions.

Added code to sort the tables at module initialization.  Three
dictionaries, confstr_names, sysconf_names, and pathconf_names, are
added to the module as well.  These map known configuration setting
names to the numeric value which is used to represent the setting in
the system call.  This code is always called.

Updated related comments.