donloads: show the installer/package release date
Yet Another Msygit Fix. Store the installer's release date as a separate field, as it's not always the date that the version was tagged. This allows us to report the correct release date in the /download/win page. Unfortunately the msysgit downloads aren't always uploaded to github on the date that the installer has, so we need to parse it to get the release date.
Fix broken link to Git Pro book on download pages
There can be multiple installers for one git version with fixes for the Windows distribution. Thus ordering only by 'versions.vorder' is not enough, as we'll get a random downloader. Sort the entries by filename so we get the latest installer.
Replace original GitX with GitX (L)
Fix icon positions on reference index
Fix anchor href rendering for Section anchors