Expose program kill function in UI.
newline after default text when creating file
Merge branch 'm4burns-fixes' of https://github.com/m4burns/seashell
make program kill write to console after killing program, also fixed typos
fixed Marmoset submit bug
changed the array sorting function call to be the standard cross-browser version
Partially fixed file upload bug

File uploading works, but the browser does not update the project info properly
without reloading the current project.
completed file upload fix
codemirror will switch between c mode, scheme mode, and plain text appropriately
[backend] Fix permissions issue on old files.
[backend] Simpliy directory-hidden?
[backend] Use some-system-path->string instead of path->string.