v6.0.19

* Issue **#1322** : Stroom now asks if you really want to leave site when stepping items are dirty. Also fixed `Save` and `Save All` menu items and dashboard param changes now correctly make a dashboard dirty.

* Issue **#1320** : Fixed formatting of XML where trailing spaces were being removed from content surrounded by start and end tags (data content) which should not happen.

* Issue **#1321** : Make path relative in stroom distribution .zip.sha256 hash file.