[sac-dev] bug fix: read write header

[Brian Savage]

All,

I have created a patch for the read header / write header bug discovered
a while back.  It effectively handles big and small endian files.

This patch determines the file's endianness and writes the appropriate
header. During a write header, this is the logic:

- Open file to be written (file must already exist)
- Read in Old Header
- Examine Version Number
- If version number between 1 and current version (6)
    - Write header
- If version number not between 1 and current version (6)
    - Swap version number
    - If version number not between 1 and current verison (6)
         Issue Error
    - If version number between 1 and current version (6)
         Write swapped header
- Close File

Based on the current CVS version, please test and get back to me.

Cheers,
Brian
savage13 at dtm.ciw.edu
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