Pluralize agent_nb_class

This is more consistent with the block name for jobs
Remove comment that does not apply here

This was a stupid copy-paste error
Make filtering agents by hostname case insensitive
Merge pull request #192 from guidow/agents_index_ui_fixes

Agents index ui fixes
Add Jobs index user interface
Fix copy-paste mistake
Implement delete singlejob for UI
Commit db session before deleting job

These seems to help with some race issues when using SQLite
Implement rerun single job