Pyamares

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**Added**
- Add a ``read_fidall`` function to read GE MNS Research Pack **fidall** generated MAT-files.

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**Fixed**
- Instead of try .. catch, use ``def is_mat_file_v7_3(filename)`` to identify if a ifle is V-7.3

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**Added**
- The ``readmrs`` function now supports any MAT-files containing either an ``fid`` or ``data`` variable. This enhancement makes it compatible with GE fidall reconstructed MAT-files as well as Matlab formats written by jMRUI.

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**Fixed**
- Fixed a bug where, if the ppm needs to be flipped while the carrier frequency is not 0 ppm, the resulting spectrum looks wrong with a fftshift().

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**Added**
- An argument ``noise_var`` to ``initialize_FID`` that allows users to select CRLB estimation methods based on user-defined noise variance. By default, it employs the noise variance estimation method used by OXSA, which estimates noise from the residual. Alternatively, users can opt for jMRUI's default method, which estimates noise from the end of the FID.

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**Added**
- Fixed the ``carrier`` placeholder. If ``carrier`` is not 0 ppm, shift the center frequency accordingly.