Averaging MITgcm output:

The program and scripts here are a few quick hacks that efficiently
average binary files as output by MITgcm.  The following assumptions
apply:

  - all files are SINGLE-precision IEEE-754 stored in BIG-endian byte
    order (which is the standard for MITgcm single-precision MDSIO
    output)

  - the machine itself is a LITTLE-endian architecture such as:

    - IA32 (Intel or AMD x86-compatible)
    - Linux on IA64 (eg. Altixes)


The program syntax is:

  $ make average_fields
  $ ./average_fields field_1 field_3 ... field_n output_field


The additional scripts demonstrate how to easily run N simultaneous
copies of the average_fields program on an Altix system such as
Columbia.