XMGED - New Environment Variables

# New Environment Variables

## MGED_SRC_DIR

This defines the directory that is searched for command files to be used with the source command. If this is not defined or the command file is not found in this directory, the current directory is searched. If the command file is still not found, the user's home directory is searched.

## MGED_HISTORY

This defines the history file that is read in during the initialization process. If this is not defined, the current directory is searched for the file named .mged_histrc. Then, if the file is not found here, it is searched for in the user's home directory. The commands in this file are only loaded into the history list and not executed.

## MGED_JOURNAL

This defines the journal file that is written to when journalling is active. If this is not defined, the file named mged.journal is created and used in the current directory.

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