preliminary changes in pack_callback and unpack_callback to use complex numbers
preliminary changes in pack_callback and unpack_callback to use complex numbers

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