added tests:
	test_abundance_dist_single_nosquash()
	test_abundance_dist_single_savetable()
	test_filter_abund_2_singlefile()
adds test coverage towards issue 386, plus additional general test
coverage
added load_into_counting_multifile() test
`Updated ChangeLog and formatted
Removed lingering merge marker
update changelog
pass newly req'd force argument
Merge pull request #713 from ged-lab/fix/test386

Fix/test386