mat_recon_pipe updated readme

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mat_recon_pipe rad_mat now writes a copy of the headfile before we start reconstruction to make it easier to track down errors.

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added new options to average at different points of the code, all are works in progress thus far.

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rad_mat load_scanner_header fixed typo


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DCE_T1map.m some descriptive comments added, code modified to fail at run time becuase its out of date compred to other versions

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