This file contains the routine that reads the .elev file. It utilizes the primitive scanner defined in tokenizer.c to help it read the file. The data read from the file is stored in the elev variable. The elev variable is defined in this file. All of the access routines to the elev variable are also in this file. Note that elev is not directly accessible outside of this file -- outsiders wanting access to elev's data must use the accessors.