reduce memory requirements to run tests
initial work for issue 399
autopep8
fixed syntax errors in force parser and fixed 2 other errors with args.force
fixed some formatting and combined 2 if statements into 1
Fixed typo
Fixed typos
Added force option to all scripts to script IO sanity checks and updated tests to match
pep8
Merge pull request #647 from jessicamizzi/fix/check-override

initial work for issue 399: add --force flag
refresh coverity instructions
fixed bug in reporting of % written
change slice-reads-by-coverage.py to replace N with A instead of G
updated ChangeLog
fix pep8 violation in trim-low-abund.py
Merge pull request #706 from ged-lab/update/streaming

Two minor bug fixes to sandbox scripts
Merge pull request #701 from ged-lab/fix/tests-nohighmem

reduce memory requirements to run tests
added test to import all sandbox scripts w/o executing them; see #707
fixed import of all .py scripts in sandbox/
added exec test for all sandbox scripts