Update apply_threshold.py

Allow for negative thresholds.
12 jobs for 35-cannnot-provide-negative-values-to-the-apply_threshold-script in 16 minutes and 2 seconds (queued for 9 seconds)
Status Job ID Name Coverage
  Build
passed #103406
conda-linux
build_linux_27

00:05:16

passed #103407
conda-linux
build_linux_35

00:05:19

passed #103408
conda-linux
build_linux_36

00:02:20

passed #103409
conda-macosx
build_macosx_27

00:03:14

passed #103410
conda-macosx
build_macosx_35

00:03:20

passed #103411
conda-macosx
build_macosx_36

00:03:08

 
  Test
passed #103412
conda-linux
test_linux_27

00:02:30

85.0%
passed #103413
conda-linux
test_linux_35

00:02:39

85.0%
passed #103414
conda-linux
test_linux_36

00:01:45

85.0%
passed #103415
conda-macosx
test_macosx_27

00:03:22

85.0%
passed #103416
conda-macosx
test_macosx_35

00:03:21

85.0%
passed #103417
conda-macosx
test_macosx_36

00:03:26

85.0%