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Add sort lines option to the editor

1

Extend CodeMirror to provide `Sorting ascending/descending lines` selection option for eg. ```ledger 2018-08-04 price VBMPX 63.48 USD 2017-08-04 price RGAGX 64.31 USD 2016-08-04 price ITOT 184.36 USD 2014-08-04 price VEA...