DISCUSSION-error-levels

This file is intended for the developers to discuss plans for
error-level handling.  When/if this is implemented in Gri, the present
file will be removed from the CVS tree.

Basic idea: have 3 levels of error tolerance, set by a commandline
flag perhaps of the following form:

	-error_tolerance ERROR_LEVEL

where 
	ERROR_LEVEL = 0: stop executation if _any_ error is encountered
	ERROR_LEVEL = 1: stop executation if one or more level-1 errors 
	                 is encountered
	ERROR_LEVEL = 2: stop executation if one or more level-2 errors 
	                 is encountered, or if one or more level-1
                         errors is encountered

LEVEL 0 ERROR LIST:
	- add items to this list -

LEVEL 1 ERROR LIST:
	- add items to this list -

LEVEL 2 ERROR LIST:
	- add items to this list -