Updated I/O extension reading to accomodate .mrc and .mrcs movie inputs
Updated I/O extension reading to accomodate .mrc and .mrcs movie inputs

cianfrocco-lab/cryoem-cloud-tools,leschzinerlab/AWS,cianfrocco-lab/cryoem-cloud-tools,cianfrocco-lab/cryoem-cloud-tools,cianfrocco-lab/cryoem-cloud-tools,cianfrocco-lab/cryoem-cloud-tools,leschzinerlab/AWS,cianfrocco-lab/cryoem-cloud-tools