Fix bruker spect sf

[jtrebosc]

Reference frequencies when importing from Bruker was not correctly handled. This pull request fixes the way SF is calculated in processed data and in acquisition data importations. For acquisition import, one problem is that reference frequency (SF) is stored in processing parameters in pdata subfolder. There can exist several processed datasets with different SF parameters. Some processed data can be projections or slices of specific dimension. The new import search across all pdata folders for processed parameter files of the same dimensionality as acquisition parameters as defined in ParMODE. If several sets of ref frequencies are found it uses the set of lowest procno number and displays alternate sets in metadata.

I'm waiting for possible comments before accepting the pull request. Best, Julien

[wfranssen]

Hi Julien,

I have always been a bit uncertain about the way we handled these references for Bruker. I observed before that the reference was almost OK, but not quite. But never found out what the actual issue was. So I am happy to see your contribution.

Regards,

Wouter

[jtrebosc]

Actually, there are a couple bugs that remain to be fixed :

• handling of AQSEQ parameter for 3D sequence
• converting to float any dataset as it happens to get int overflow on some datasets
• handling the NC parameter when reading raw data (fid/ser) Let's fix all before merging the pull request.