commit what I have for now on local branch jipuwang
added table3D.dump to repo for use
Merge branch 'jipuwang'
1. added %table3D attribute in ExpTableType to store the polar dependent exponential table.
2. added reading statement for tabel3D.dump in IO.f90
   a) the %minVal=-16.0D0 for table3D
   b) the %maxVal=-0.0D0 for table3D
   c) the dimensions are %table3D(1:2,-16000:0,1:4)
1. added expoa(:,:) and expob(:,:) in sweeper.f90 to mimic the inlining of the exponential call
2. added the assignment of these two arrays in the initializeSweeper subroutine
added sweep2D_prodquad_P0_vectoripol1_2 to incorporate the inlinning exponential linear interpolation.
with table3D, test cases run, but with a relative large error E-06. The reason is partially due to we are comparing with the solution from using table2D.
my current version before cleanning things up
conflict fixed