Run more tests

Trying to run as many tests as possible. The really slow one is test_resampling_slow, which takes 450-500 sec, so it is now marked "veryslow" ;D and the slow tests are run. (Maybe it could be simplified ?) Another issue is the Muselet test which print a lot of things, which makes it difficult to go through the test results. So I have captured the output from the dosex command to put it in a file, does it seem ok ?

The slow tests that are now run:

tests.sdetect.test_muselet.test_muselet: 160.8706s
tests.sdetect.test_origin.TestORIGIN.test_main: 37.9593s
tests.sdetect.test_sea.test_SEA: 34.7161s
tests.sdetect.test_source.TestSource.test_add_narrow_band_image: 4.8083s
tests.obj.test_spectrum.test_resample: 1.2180s