WICKET-5685 jquery.wicketatmosphere.js is not packed in wicket-atmosphere.jar and thus leads to 404

(cherry picked from commit 2dd4f515d7d4eefd272b1d79793b9efcd009ee61)
Do not catch Throwable but Exception

(cherry picked from commit a5954823353f20a6157156704ae91d6067a1f5c8)
Do not catch Throwable but Exception
Add a hashCode() impl next to the #equals()
Do not catch Throwable but Exception
Do not catch Throwable but Exception
Add hashCode() next to equals
Simplify an expression. Remove e.printStackTrace() from code in src/main/java
WICKET-5683 PreviousButton isEnabled() should bo logical conjunction of
getWizardModel().isPreviousAvailable() and super.isEnabled()
WICKET-5684 Autocomplete example renders the search term
WICKET-5683 PreviousButton isEnabled() should bo logical conjunction of
getWizardModel().isPreviousAvailable() and super.isEnabled()