Reduced the required gcc version to 4.3.2

- pass through normal paraview (double-dashed) options

- bypass the plugins logic when the --data=... option is provided.
  This allows the command 'paraFoam --data=...' to work too.

- use standard *.sh, *.csh endings

- need to trap possibly weird input within etc/bashrc, etc/cshrc and
  can't easily redirect stderr in csh.