v7.0-beta.71

* Issue **#1957** : Fix invaldiation of the stat datasource caches on content import and other changes.

* Issue **#1960** : Fix the data preview display of empty streams.

* Moved content download to Java.

* All paths in the config YAML including logging config can now be made relative to the home dir.

* Issue **#1912** : Moved dashboard table conditional formatting logic to server.

* Fix missing favicon.

* Issue **#1808** : Fix bug with permission handling for Retention Policy feature.

* Issue **#1948** : Made UI report errors that occur during download.

* Issue **#1944** : You can now define a stroom home config property and all relative paths will become subpaths of this location.

* Fix byte conversion bug with `read()` method in RASegmentInputStream.

* Add `viewType` and `displayType` args to `data(...)` dashboard expression.

* Fix task spinner appearing briefly on every poll and consumign a lot of CPU.

* Add _progress_ bar to Source Data view and Data Preview to show location in the file.

* Issue **#1678** : Fix data display in dashboard text pane.

* Issue **#1679** : Fix data display in dashboard text pane.

* Issue **#1777** : Fix sub stream tab selection when switching streams in data screen.

* Issue **#1647** : Right align numeric columns in data screen.

* Issue **#1872** : Fix display of source data when data has no line breaks.

* Add completion and snippets to dashboard expression builder.

* Issue **#1895** : Change dashboard field expression editor use the Ace editor like other edit screens.

* Replace stream Info icon on data screen with a sub-stream type tab.

* Add Source View tab available from Data Preview screen to show the unformatted source data.

* Fix highlighting while stepping single line data.

* Add completion and snippets to edit screens using the ACE editor.

* Add editor options to use Vim bindings, show invisble chracters, highlight current line, word wrap.

* Issue **#1949** : Fixed bug in download for streams from multiple feeds.