CMake: robust version extraction for P4Est
CMake: robust version extraction for P4Est

Make the version extraction in P4Est more robust: We should not rely on
the version string to define SUBMINOR and PATCH - this doesn't have to
be the case. So, always set P4EST_VERSION_SUBMINOR and
P4EST_VERSION_PATCH to "0" in FindP4EST.cmake if no valid number could
be extracted.

JaeryunYim/dealii,flow123d/dealii,JaeryunYim/dealii,johntfoster/dealii,gpitton/dealii,JaeryunYim/dealii,naliboff/dealii,johntfoster/dealii,adamkosik/dealii,shakirbsm/dealii,kalj/dealii,nicolacavallini/dealii,kalj/dealii,rrgrove6/dealii,spco/dealii,adamkosik/dealii,sriharisundar/dealii,sairajat/dealii,nicolacavallini/dealii,andreamola/dealii,lpolster/dealii,YongYang86/dealii,nicolacavallini/dealii,ESeNonFossiIo/dealii,flow123d/dealii,ESeNonFossiIo/dealii,Arezou-gh/dealii,shakirbsm/dealii,naliboff/dealii,JaeryunYim/dealii,JaeryunYim/dealii,lpolster/dealii,pesser/dealii,andreamola/dealii,nicolacavallini/dealii,angelrca/dealii,kalj/dealii,ESeNonFossiIo/dealii,angelrca/dealii,lpolster/dealii,johntfoster/dealii,jperryhouts/dealii,spco/dealii,mac-a/dealii,Arezou-gh/dealii,johntfoster/dealii,lue/dealii,natashasharma/dealii,mac-a/dealii,msteigemann/dealii,mtezzele/dealii,msteigemann/dealii,mac-a/dealii,sriharisundar/dealii,sairajat/dealii,EGP-CIG-REU/dealii,rrgrove6/dealii,mtezzele/dealii,maieneuro/dealii,danshapero/dealii,sairajat/dealii,spco/dealii,sairajat/dealii,kalj/dealii,naliboff/dealii,adamkosik/dealii,kalj/dealii,angelrca/dealii,shakirbsm/dealii,rrgrove6/dealii,maieneuro/dealii,danshapero/dealii,YongYang86/dealii,maieneuro/dealii,natashasharma/dealii,johntfoster/dealii,JaeryunYim/dealii,EGP-CIG-REU/dealii,johntfoster/dealii,lpolster/dealii,shakirbsm/dealii,rrgrove6/dealii,ESeNonFossiIo/dealii,mac-a/dealii,flow123d/dealii,naliboff/dealii,EGP-CIG-REU/dealii,ibkim11/dealii,pesser/dealii,pesser/dealii,naliboff/dealii,Arezou-gh/dealii,danshapero/dealii,msteigemann/dealii,mtezzele/dealii,ESeNonFossiIo/dealii,maieneuro/dealii,adamkosik/dealii,lue/dealii,ibkim11/dealii,lue/dealii,spco/dealii,ibkim11/dealii,EGP-CIG-REU/dealii,maieneuro/dealii,YongYang86/dealii,sriharisundar/dealii,jperryhouts/dealii,johntfoster/dealii,natashasharma/dealii,andreamola/dealii,sriharisundar/dealii,mtezzele/dealii,gpitton/dealii,kalj/dealii,pesser/dealii,naliboff/dealii,lue/dealii,jperryhouts/dealii,ibkim11/dealii,angelrca/dealii,sairajat/dealii,pesser/dealii,danshapero/dealii,rrgrove6/dealii,spco/dealii,flow123d/dealii,lue/dealii,gpitton/dealii,jperryhouts/dealii,sriharisundar/dealii,maieneuro/dealii,jperryhouts/dealii,gpitton/dealii,nicolacavallini/dealii,msteigemann/dealii,natashasharma/dealii,nicolacavallini/dealii,Arezou-gh/dealii,ESeNonFossiIo/dealii,andreamola/dealii,pesser/dealii,naliboff/dealii,ibkim11/dealii,danshapero/dealii,lpolster/dealii,shakirbsm/dealii,YongYang86/dealii,ESeNonFossiIo/dealii,natashasharma/dealii,danshapero/dealii,mac-a/dealii,mtezzele/dealii,gpitton/dealii,pesser/dealii,JaeryunYim/dealii,lue/dealii,jperryhouts/dealii,danshapero/dealii,msteigemann/dealii,EGP-CIG-REU/dealii,gpitton/dealii,msteigemann/dealii,rrgrove6/dealii,mac-a/dealii,Arezou-gh/dealii,shakirbsm/dealii,shakirbsm/dealii,kalj/dealii,andreamola/dealii,EGP-CIG-REU/dealii,adamkosik/dealii,YongYang86/dealii,rrgrove6/dealii,nicolacavallini/dealii,mac-a/dealii,ibkim11/dealii,angelrca/dealii,spco/dealii,Arezou-gh/dealii,jperryhouts/dealii,andreamola/dealii,mtezzele/dealii,lpolster/dealii,flow123d/dealii,YongYang86/dealii,flow123d/dealii,sairajat/dealii,adamkosik/dealii,flow123d/dealii,sairajat/dealii,Arezou-gh/dealii,angelrca/dealii,angelrca/dealii,maieneuro/dealii,spco/dealii,mtezzele/dealii,sriharisundar/dealii,EGP-CIG-REU/dealii,lue/dealii,YongYang86/dealii,msteigemann/dealii,ibkim11/dealii,natashasharma/dealii,adamkosik/dealii,lpolster/dealii,natashasharma/dealii,gpitton/dealii,andreamola/dealii,sriharisundar/dealii