Rename quad/sytem to quad/system

mentioned in issue #17 (closed)

We decided xps_project is more helpful than system, so we will use that.

closed via commit 38ad9f47

38ad9f47 was reverted (https://git.ece.iastate.edu/danc/MicroCART_17-18/merge_requests/14), so this issue needs to be reopened.

reopened

mentioned in commit 38ad9f47

closed via commit e3e977cb