[WIP] Function to copy derivatives

[Remi-Gau]

fixes #78

Added a functionderivate(BIDS, out_path, name, varargin) which exports the files from current BIDS layout into out_path/name folder. In other words exports data into derivatives.

varargin are the query options same as in bids.query, in fact they are passed directly to it.

To do (help needed!):

• Options -- when created derivatives, there a list of usefull options to fine tune, but adding them will make list of parameters to long. Options that I would like to include are below.
• Script add a line to dataset_description a new structure each time it is run. But on the third run it crashes (see below) referred into another PR.
• Add version of bids-matlab (does it exists?) TODO when when have a version number.
• Optimise the loop on files (see Provide easy way to loop over files as structure #161)
• Copy of derivatives. Actually it supports only full paths in dependencies.*field. Refered in another issue
• Copy of participants.tsv and scans.tsv files
• Tests

Options

• unzip -- if true, then zipped files are unzipped
• copy_dependencies -- if true, the files that current file depend on are copied even if they are not explicitely queried
• force -- copy file even if he already exists in output. Mutually exclusve with copy_dependencies to avoid circular copy

Crashes during dataset_description generation:

Error using horzcat
Dimensions of matrices being concatenated are not consistent.

Error in bids.derivate (line 68)
    description.GeneratedBy = [description.GeneratedBy pipeline];

[Remi-Gau]

PR #162 reopened from the feature branch

[codecov]

Codecov Report

Merging #171 (63a9b1b) into dev (c91f32d) will not change coverage.
The diff coverage is 0.00%.

@@          Coverage Diff          @@
##             dev    #171   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files         25      29    +4     
  Lines        933    1012   +79     
=====================================
- Misses       933    1012   +79     

Flag	Coverage Δ
unittests	0.00% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
+bids/+internal/append_to_layout.m	0.00% <0.00%> (ø)
+bids/+internal/ends_with.m	0.00% <0.00%> (ø)
+bids/+internal/get_meta_list.m	0.00% <0.00%> (ø)
+bids/+internal/get_metadata.m	0.00% <0.00%> (ø)
+bids/+internal/parse_filename.m	0.00% <0.00%> (ø)
+bids/+internal/starts_with.m	0.00% <0.00%> (ø)
+bids/copy_to_derivative.m	0.00% <0.00%> (ø)
+bids/layout.m	0.00% <0.00%> (ø)
+bids/query.m	0.00% <0.00%> (ø)
... and 3 more

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[Remi-Gau]

Once the tests check out green I will merge this into dev and open issues for the remaining TODOs