Changing usage to print_usage

[Bill Denney]

I like the use of print_usage() better than regular usage(), and it is
definitely more informative.  So, I thought I'd make a patch to do that. 
Essentially, I just looked at the scripts directory with the commands:

for I in `grep -rl usage *`
do \
    cat $I | sed -e 's/ usage.*/ print_usage\(\);/' > tmpfile
    mv tmpfile $I
done

and I then went through the cvs diff file to make sure what I did was
correct.

I removed everything that I saw that looked incorrect, and that was all
the uses of the usage command except for in

miscellaneous/license.m
plot/__axis_label__.m
plot/__errcomm__.m
plot/__plt__.m

There are a few other changes in there (for example in mean.m and
moment.m, usage was used where error should have been used).  I'm not
listing the files touched because there are 506 of them, and there are
only 297 more .m files in the scripts directory.

Bill

scripts/Changelog:

2006-10-09  Bill Denney

    * *.m: change almost all occurrances of usage() to print_usage()

print_usage.diff.gz
Description: GNU Zip compressed data