hgview #259572 Add a "--version" option [done]

While trying to fix a bug, a crash occured; so I wanted to use "--version" but it does not exist... Using aptitude instead:

Version: 1.8.0-1
priorityminor
typeenhancement
done in<not specified>
load left0.000
closed by#f1ef01d91b39 [option] add a version option (closes #259595, #259572, #105330, #7316)