Added call to suspend thread, checks for errors.
Changed the name of the suspend file to follow naming conventions.
Added tentative functionality to xsh_kill, needs testing, COMPILES
Added jobkill to the shell files and makefile so that it is compiled and recognized as a command in commandline.
Added function documentation and added code to run syscalls for foregrounding and backgrounding
Changed return values for functions to conform to Xinu standards
Delete .xsh_jobskill.c.swo
Delete .jobsgroup.c.swo
Delete xsh_jobskill.c

Changed to jobkill
Made things compile
Merge
Merge branch 'jobs_kill' of https://github.com/cmh6807/xinu-arm-job-control-shell into jobs_kill
Fix merge
strcmp doesn't exist, but strncmp does
Merge branch 'job_control_shell' of https://github.com/cmh6807/xinu-arm-job-control-shell into job_control_shell
Merge branch 'job_control_shell' of https://github.com/cmh6807/xinu-arm-job-control-shell into jobs_kill
Delete .jobsgroup.h.swo
Merge branch 'job_control_shell' of https://github.com/cmh6807/xinu-arm-job-control-shell into fg_bg
Added code that should allow fg and bg commands to work properly
Merge branch 'jobs_kill' of https://github.com/cmh6807/xinu-arm-job-control-shell into jobs_kill