Further simplify code.
Further simplify code.

Since MappingQ is now no longer derived from MappingQ1, we can simplify
the implementation of the MappingQ::transform functions.

adamkosik/dealii,angelrca/dealii,pesser/dealii,sairajat/dealii,naliboff/dealii,pesser/dealii,JaeryunYim/dealii,kalj/dealii,adamkosik/dealii,Arezou-gh/dealii,EGP-CIG-REU/dealii,pesser/dealii,gpitton/dealii,andreamola/dealii,spco/dealii,jperryhouts/dealii,maieneuro/dealii,sairajat/dealii,shakirbsm/dealii,YongYang86/dealii,ESeNonFossiIo/dealii,YongYang86/dealii,andreamola/dealii,Arezou-gh/dealii,EGP-CIG-REU/dealii,danshapero/dealii,angelrca/dealii,YongYang86/dealii,adamkosik/dealii,andreamola/dealii,andreamola/dealii,ESeNonFossiIo/dealii,maieneuro/dealii,kalj/dealii,gpitton/dealii,spco/dealii,maieneuro/dealii,sairajat/dealii,danshapero/dealii,EGP-CIG-REU/dealii,ibkim11/dealii,nicolacavallini/dealii,ESeNonFossiIo/dealii,nicolacavallini/dealii,angelrca/dealii,ESeNonFossiIo/dealii,JaeryunYim/dealii,spco/dealii,gpitton/dealii,nicolacavallini/dealii,kalj/dealii,YongYang86/dealii,gpitton/dealii,ibkim11/dealii,spco/dealii,ESeNonFossiIo/dealii,Arezou-gh/dealii,ibkim11/dealii,danshapero/dealii,shakirbsm/dealii,danshapero/dealii,naliboff/dealii,spco/dealii,andreamola/dealii,YongYang86/dealii,maieneuro/dealii,EGP-CIG-REU/dealii,nicolacavallini/dealii,gpitton/dealii,gpitton/dealii,adamkosik/dealii,nicolacavallini/dealii,ESeNonFossiIo/dealii,andreamola/dealii,angelrca/dealii,EGP-CIG-REU/dealii,Arezou-gh/dealii,ibkim11/dealii,Arezou-gh/dealii,ibkim11/dealii,jperryhouts/dealii,Arezou-gh/dealii,YongYang86/dealii,pesser/dealii,naliboff/dealii,kalj/dealii,JaeryunYim/dealii,adamkosik/dealii,jperryhouts/dealii,naliboff/dealii,kalj/dealii,JaeryunYim/dealii,sairajat/dealii,angelrca/dealii,jperryhouts/dealii,sairajat/dealii,pesser/dealii,adamkosik/dealii,pesser/dealii,maieneuro/dealii,danshapero/dealii,jperryhouts/dealii,YongYang86/dealii,spco/dealii,nicolacavallini/dealii,angelrca/dealii,adamkosik/dealii,ESeNonFossiIo/dealii,maieneuro/dealii,JaeryunYim/dealii,maieneuro/dealii,Arezou-gh/dealii,kalj/dealii,nicolacavallini/dealii,naliboff/dealii,naliboff/dealii,shakirbsm/dealii,ibkim11/dealii,spco/dealii,sairajat/dealii,andreamola/dealii,shakirbsm/dealii,JaeryunYim/dealii,shakirbsm/dealii,sairajat/dealii,EGP-CIG-REU/dealii,gpitton/dealii,angelrca/dealii,EGP-CIG-REU/dealii,ibkim11/dealii,shakirbsm/dealii,naliboff/dealii,danshapero/dealii,danshapero/dealii,jperryhouts/dealii,pesser/dealii,kalj/dealii,jperryhouts/dealii,shakirbsm/dealii,JaeryunYim/dealii