parpack: add additional solve() which takes eigenvectors as pointers
parpack: add additional solve() which takes eigenvectors as pointers

sairajat/dealii,sairajat/dealii,naliboff/dealii,naliboff/dealii,naliboff/dealii,sairajat/dealii,naliboff/dealii,sairajat/dealii,naliboff/dealii,naliboff/dealii,sairajat/dealii,naliboff/dealii,sairajat/dealii,sairajat/dealii