[backend] Result.syserr is not useful any longer

Given the whole system is now based on the Django framework, we can immediately use the e-mailing capabilities of Django to send e-mail to administrators in case a problem is perceived anywhere in the code, making the use of this field on Results a bit useless.

Currently, on our base deployment system every error message emitted by the code is sent via e-mail to system administrators. We can use this to ship the error messages instead of moving it around in an object.