COMP: Fix shadowed variable warnings
COMP: Hide unused Fortran interfaces to gmvread.c to silence unused warnings

      Reverted variable renamings from previous commit that silenced shadow
      warnings in now disabled code block.
COMP: Hide unused global variables to silence unused warnings
COMP: Fix maybe used uninitialized warnings issued by GCC
Fix development install issues.

VisItCommon was overriding the install locations set by the application, which
is bad. That was resulting in the files being installed in inappropriate
locations. This fixes that issue.