Fix error messages.
Fix error messages.

There was a space  missing in a couple of places, but more importantly we cannot
directly output objects of type types::boundary_id (==char). They need to be cast
to integers to yield something useful.

maieneuro/dealii,angelrca/dealii,pesser/dealii,pesser/dealii,spco/dealii,ESeNonFossiIo/dealii,nicolacavallini/dealii,shakirbsm/dealii,nicolacavallini/dealii,ESeNonFossiIo/dealii,gpitton/dealii,danshapero/dealii,JaeryunYim/dealii,pesser/dealii,angelrca/dealii,sairajat/dealii,ESeNonFossiIo/dealii,EGP-CIG-REU/dealii,danshapero/dealii,nicolacavallini/dealii,shakirbsm/dealii,JaeryunYim/dealii,naliboff/dealii,kalj/dealii,jperryhouts/dealii,shakirbsm/dealii,kalj/dealii,Arezou-gh/dealii,angelrca/dealii,gpitton/dealii,kalj/dealii,shakirbsm/dealii,angelrca/dealii,nicolacavallini/dealii,jperryhouts/dealii,shakirbsm/dealii,andreamola/dealii,sairajat/dealii,pesser/dealii,maieneuro/dealii,sairajat/dealii,ESeNonFossiIo/dealii,nicolacavallini/dealii,JaeryunYim/dealii,angelrca/dealii,sairajat/dealii,naliboff/dealii,spco/dealii,danshapero/dealii,Arezou-gh/dealii,andreamola/dealii,danshapero/dealii,Arezou-gh/dealii,shakirbsm/dealii,maieneuro/dealii,maieneuro/dealii,JaeryunYim/dealii,danshapero/dealii,EGP-CIG-REU/dealii,maieneuro/dealii,gpitton/dealii,jperryhouts/dealii,jperryhouts/dealii,naliboff/dealii,EGP-CIG-REU/dealii,JaeryunYim/dealii,ESeNonFossiIo/dealii,spco/dealii,Arezou-gh/dealii,naliboff/dealii,andreamola/dealii,nicolacavallini/dealii,shakirbsm/dealii,jperryhouts/dealii,EGP-CIG-REU/dealii,angelrca/dealii,spco/dealii,EGP-CIG-REU/dealii,andreamola/dealii,andreamola/dealii,sairajat/dealii,EGP-CIG-REU/dealii,pesser/dealii,spco/dealii,naliboff/dealii,kalj/dealii,naliboff/dealii,kalj/dealii,sairajat/dealii,ESeNonFossiIo/dealii,pesser/dealii,ESeNonFossiIo/dealii,JaeryunYim/dealii,spco/dealii,Arezou-gh/dealii,naliboff/dealii,gpitton/dealii,spco/dealii,gpitton/dealii,maieneuro/dealii,JaeryunYim/dealii,pesser/dealii,andreamola/dealii,nicolacavallini/dealii,sairajat/dealii,Arezou-gh/dealii,danshapero/dealii,gpitton/dealii,Arezou-gh/dealii,andreamola/dealii,angelrca/dealii,danshapero/dealii,jperryhouts/dealii,gpitton/dealii,kalj/dealii,EGP-CIG-REU/dealii,jperryhouts/dealii,kalj/dealii,maieneuro/dealii