Enable Support of 2 'Sample Name' chaining to allow representation/tracking of Aliquots

[proccaserra]

Required by Imperial (and most likely all phenome centres): requested by Jake Pearce/Nourredin Sadawi

Protocol type should be set to 'aliquoting' to allow standard parsing.

ISAcreator-1.7+ currently support multiple Sample Name occuring on the Assay Table
<field header="Sample Name" data-type="String" is-file-field="false"
is-multiple-value="true" is-required="true" is-hidden="false" is-forced-ontology="false">


[INSTITUTION].Group-[GROUP_NO].Subject-[SUBJECT_NO].[SAMPLE_EXTRACT]

In case, ISA users were to prefer coding aliquoting event at the 'studySample' level, it would require
modifying ISA configuration to set the 'is_multiple_value' to 'true' in the studySample.xml file:

and amend the ISA java parser/validator, which seems confused if multiple 'Sample Name' header appear in that Table.

TODO: Check if and how ISA-API and ISA python validator/converter handle these representations

TODO: produce ISA-TAB files for testing

[djcomlab]

Fixed in develop, closing