Reimplement Sum Scan with pattern matching.

Code to Implement

file:	src/main/sml/warmup_sum_scan_pattern/sum_scan_pattern.sml
functions:	sum_scan

Test

source folder:	src/test/sml/warmup_sum_scan_pattern
how to run with CM.make verbosity off:	sml -Ccm.verbose=false run_sum_scan_pattern_testing.sml
how to run with CM.make verbosity on:	sml run_sum_scan_pattern_testing.sml

note: ensure that you have removed all printing to receive credit for any assignment.