For the TTL option, allow the admin to set a default in iinit.c and
use that if TTL is required but not provided.  Also, add a comment about 
etting possibly large limits for batch jobs in icatHighLevelRoutines.c.

These improvements were provided by Andreas Lindqvist of the National
Supercomputer Centre (NSC) Swedish National Infrastructure for
Computing (SNIC).


git-svn-id: svn://irodssvn.ucsd.edu/trunk@5487 ea137bd6-aa86-47b6-b90d-b101d9f19a90