Batch anonymising and converting of datasets

[p-j-smith]

Changes made:

• Added function batchAnonymise.m to anonymise userdata. The fields containing the path to the original data are removed as we cannot guarantee this do not contain potentially identifiable data
• Added a function openep_updateuserdata.m to improve interoperability with openep-py. This converts userdata.surface.triRep into a struct, which can be read by openep-py (whereas a triRep cannot be read)
• Added function batchConvert.m , which converts converts triRep to struct for all .mat in a directory
• By default, each of these functions saves files as version -v7, which is faster to load in openep-py than -v7.3, and the saved file is significantly smaller compared to -v6 files.
• Ensure getMesh is used where necessary (rather than e.g. userdata.surface.triRep.X)

[codecov[bot]]

Codecov Report

Merging #63 (3a613ba) into develop (ea779f7) will increase coverage by 1.10%. The diff coverage is 56.14%.

@@            Coverage Diff             @@
##           develop     #63      +/-   ##
==========================================
+ Coverage     7.03%   8.14%   +1.10%     
==========================================
  Files          144     147       +3     
  Lines         6805    6862      +57     
==========================================
+ Hits           479     559      +80     
+ Misses        6326    6303      -23     

Impacted Files	Coverage Δ
editUserdata.m	0.00% <0.00%> (ø)
generateInterpData.m	0.00% <0.00%> (ø)
getAblationArea.m	0.00% <0.00%> (ø)
getAnatomicalStructures.m	0.00% <0.00%> (ø)
getArea.m	0.00% <0.00%> (ø)
getClosedSurface.m	0.00% <0.00%> (ø)
getConductionVelocity.m	0.00% <0.00%> (ø)
getEarliestActivationSite.m	0.00% <0.00%> (ø)
getFaces.m	0.00% <0.00%> (ø)
getLatestActivationSite.m	0.00% <0.00%> (ø)
... and 10 more

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[drsewilliams]

@p-j-smith , I will approve this for merging now; but please can you add the changes to the changelog.md file (*which only exists in its own branch just now) (I have asked @nicklinton to approve the PR related to the changelog branch such that it can be propagated into the other feature branches too).