Organization of package files

[cncastillo]

Hi,

These are simple changes, but they will make clearer which code/functions GIRFReco.jl is providing.

• [x] The files with the definitions of read_gradient_txt_file, plotReconstruction, plotSenseMaps, calculateB0Maps, getSliceOrder, syncTrajAndData!, do_k0_correction!, adjustHeader!, checkAcquisitionNodes!, validateSiemensMRD!, validateAcqData!, preprocessCartesianData, removeOversampling!, mergeRawInterleaves, applyGIRF!, applyK0!, saveMap, loadMap, shiftksp! should be moved. They can be in the same folder structure, but inside src. If these functions depend in other functions you defined in GIRFReco, I would also put them in src.

• [x] This is an stylistic suggestion, but the export list is generally in the module definition. Feel free to ignore this one if you want to keep it like it is.

Not sure if your are planning to report the Code coverage of the tests, but the coverage is defined using the files in src (at least by default).

[alexjaffray]

Thanks for the great list of items! We have finished this in #4 and are working on the rest of the open issues now