Fix an occasional UnifiedDisplayView exception

Value could be used uninitialized. Pull request to third party class : https://github.com/Perspx/PXListView/pull/32
Makes footnotes reading easier.

- don’t change anchors at same page into absolute links
- read links to same page in the same web view
Fix danish help files

Fix a file not found error and standardise styling
Merge pull request #317 from barijaona/bugfixes

Bugfixes
Move to main thread interface updates after refresh

Fix some crashes, especially frequent in 10.10
When a tab is closed, reset to blank its webview

Prevent sound of some Flash videos from continuing playing
Merge pull request #321 from barijaona/bugfixes

Bugfixes