VuDL fixes and Cover generator work migrated from another branch.
Fixed typos.
Tweaks from Markus Fischer.
Use properly configured HTTP client for Amazon calls.
- Resolves VUFIND-1008
- Thanks to Eike Kleiner for the solution
Merge branch 'release-2.3'
Merge branch 'release-2.3' of https://github.com/vufind-org/vufind into release-2.3
Release 2.3 merge.
More lenient limit verification to ease combined config.
Revamped help text display to use view helper.
- Resolves VUFIND-1005
- Thanks to Luke O'Sullivan for the suggestion
- Also cleaned up page title, error handling, etc.