Additional information for operator and training

[dabercro]

New features:

• Site readiness of each site is now shown on the globalerrors page and detailed workflow view.
• The hisotric site readiness is also stored for future training.
• Key parameters of each workflow are displayed, along with a link to additional information.
• Error logs are parsed with instructions from https://twiki.cern.ch/twiki/bin/view/CMS/CompOpsPRWorkflowTrafficController#Error_Codes_Mapping, showing the details and suggesting actions of the most numerous error for a workflow