Adds files for schema version v1.1.1 with symlinks.

Adds the related_to_table_dois var to submission_schema.json.

Adds the related recids var to submission_schema.json to accommodate for related recids..

Updates the schema version number to 1.1.1 in the json files (forgot).

Adds the updated schema version (1.1.1) to the list of valid versions.

Updates schema version number referenced in the README document.

Upgrades the schema version used within code

Updates the schema version number used in the tests from 1.1.0 to 1.1.1

Updates the data type for related record id storage from string to integer. This is to disallow entry of anything other than HEPData record IDs.

Reverts a change upping the minimum version checked before running a number of validator functions.  Was updated to match most recent version number, checks are actually needed above 1.1.0.

Fixed accidental inconsistencies between this data schema and the HEPData schema. Recids now has no maxLength value. Updated table DOI to match the correct maxLength value of 128 (was 64).

Now validates related DOI entries against a regular expression.

Updates TestHEPSubmission to include valid related doi/recid entries in submission.yaml

Adds invalid recid/doi testing and related test YAML files.

Removes a hardcoded flag setting the current schema version in testing as the default is to use the most recent version.

Adds the virtual environment folder in venv/ to the .gitignore file.

Probably unnecessary. Added a minimum value of 1 to disable entry of negative, and 0 as an integer.

Updates validator testing to include new cases for valid submissions, and more invalid cases.

Adds some extra checks against the regex in the related submission testing.

Removes spaces on array entries in the related test yaml files.

Adds a uniqueness check in the related DOI and record ID entries in the schema. Also adds testing against this functionality.

* Instead use 'related_to_hepdata_records' (suggested by @20DM).
* Move new fields to end of 'properties' in JSON schema.
* Bump version to 0.3.4 in preparation for new release.