Cleanup warnings during compilation

[daniellivingston]

Many warnings are generated during compilation. Needs to be cleaned up.

[daniellivingston]

Largely fixed in dd9b74e.

Several warnings remain related to typecasting; these need to be more thoroughly vetted before fixing.

grid.F90:3234:18:

 3234 |       max_index = j
      |                  1
Warning: Possible change of value in conversion from INTEGER(8) to INTEGER(4) at (1) [-Wconversion]
grid.F90:3236:13:

 3236 |       indx = indx_8
      |             1
Warning: Possible change of value in conversion from INTEGER(8) to INTEGER(4) at (1) [-Wconversion]
grid.F90:3237:12:

 3237 |       map = map_8
      |            1
Warning: Possible change of value in conversion from INTEGER(8) to INTEGER(4) at (1) [-Wconversion]
grid.F90:478:22:

  478 |             nsdtopo = nsdtopo_8
      |                      1
Warning: Possible change of value in conversion from INTEGER(8) to INTEGER(4) at (1) [-Wconversion]
grid.F90:479:22:

  479 |             nsdgeom = nsdgeom_8
      |                      1
Warning: Possible change of value in conversion from INTEGER(8) to INTEGER(4) at (1) [-Wconversion]
grid.F90:480:22:

  480 |             npoints = npoints_8
      |                      1
Warning: Possible change of value in conversion from INTEGER(8) to INTEGER(4) at (1) [-Wconversion]
grid.F90:481:20:

  481 |             ntets = ntets_8
      |                    1
Warning: Possible change of value in conversion from INTEGER(8) to INTEGER(4) at (1) [-Wconversion]
grid.F90:490:44:

  490 |             itet(1:ntets*(grid%ndim + 1)) = itet_8(1:ntets*(grid%ndim + 1))
      |                                            1
Warning: Possible change of value in conversion from INTEGER(8) to INTEGER(4) at (1) [-Wconversion]
grid.F90:491:31:

  491 |             itettyp(1:ntets) = itettyp_8(1:ntets)
      |                               1
Warning: Possible change of value in conversion from INTEGER(8) to INTEGER(4) at (1) [-Wconversion]