Spyking-circus

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* fix a small bug in the smart search, introduced while refactoring in 0.8.7

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* fix a regression introduced in 0.8.7 for non contiguous probe indices

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* new methods to detect the peaks, more robust when low thresholds are fixed
* more accurate fitting procedure, slightly slower
* minor bug fixes
* addition of a sparsity_limit parameter in the meta merging GUI, to remove noise more precisely
* new parameter file is properly copied
* enhancement of the smoothing/alignement procedure, more accurate estimation of noisy templates
* better estimation of the amplitudes boundaries used during fitting
* optimization while removing mixtures and important bug fixes
* fix a bug in the thresholding method
* minor updates to get more refined spikes during whitening and clustering
* tests with SpikeInterface, showing clear increase in performance
* some cleaning in the parameter file
* default value for cc_merge is now 0.95, since merging functions are more robust
* noisy templates are removed by default while meta merging with a lower threshold (0.75)
* speeding up whitening and clustering steps

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* Export from manual sorting with MATLAB to phy is now possible
* Modification to pass SpikeSorters test suite

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* fix a bug while removing noisy templates in meta merging
* refactoring of the meta merging GUI, addition of bhatta distances
* meta merging more robust for non stationary recordings
* enhance logging if parameters are missing and/or not defined
* can now display the electrode labels in preview GUI
* detects if a wrong install of MPI is present (linking with mpi4py)
* conda install overwrites the old parameter file
* raw dispay of the MUA in the result GUI (to be improved)
* display an error if not all nodes on a cluster can read the datafiles
* fix a bug for thresholding method using dead times

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* fix if no spikes are found on some electrodes
* fix as mean/median-pca methods were broken (albeit not used)
* fix to prevent a rare crash while loading too sparse overlaps
* fix a bug with the new dip method in python 2.7
* add the thresholding method to extract only MUA activity (requested by users)
* channel lists in probe files can be non sorted
* memory usage is dynamically adapted to reduce memory footprint
* hdf5 and npy file format can now work with 3D arrays (x, y, time) or (time, x, y)
* fix a bug if basis for pos and neg spikes have different sizes
* add some docstrings (thanks to Jose Guzman)
* sparse export for phy is now the default
* comments can now be added in the trigger/dead times files
* 4096 channels can now run on a single machine, with low memory consumption
* basic support for 3d probes, without any visualization
* more robust to saturating channels with nan_to_num
* cc_merge set to 1 automatically if templates on few channels are detected
* fix a bug if only one artefact type is given
* fix a bug if only 2 spikes are found on a single electrode
* former parameters sim_same_elec and dip_threshold renamed into merge_method and merge_param
* sanity plots for local merges can now be produced during clustering (debug_plots in [clustering])

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