Internal links from the public egamma page

[katilp]

The egamma public info page has the following internal links:

• https://indico.cern.ch/event/185495/contributions/326089/attachments/256024/357732/eleid_wp2012_v2.pdf
• https://twiki.cern.ch/twiki/bin/view/CMS/EgammaPFBasedIsolation
• https://twiki.cern.ch/twiki/bin/view/CMS/EgammaEARhoCorrection (the link in the document is broken as it is)
• https://twiki.cern.ch/twiki/bin/view/CMS/ConversionTools

The information in these pages may have been already covered in the workshop tutorial and POET electron code, but we should either make the pages public or to add a mention of the information being covered to the page.