Checkbox ships documents and files that aren't used for anything

Checkbox 0.13.4 and trunk.

Some files that are shipped with checkbox were previously used in document reading tests, but these tests/jobs are no longer present.

For example, none of the files in data/documents/ are referenced in jobs.

This command will show any files referencing any of the files in the data subdirectories (save those that I know are indeed used by checkbox):

for i in `find data/{audio,documents,images,video,websites}/ -type f -printf "%f\n"`; do grep -r $i *; done |grep -v po

According to this the only files referenced in job files or in other data files are:

data/images/JPEG_Color_Image_Ubuntu.jpg
/data/video/Quicktime_Video.mov
/data/video/Ogg_Theora_Video.ogv
data/websites/SWF_Test.as
SWF_Test.swf
data/websites/test.jar
data/websites/javatest.html
data/websites/testindex.html
data/websites/flashvideo.html
data/websites/flashtest.html
data/websites/Flash_Video.flv