[br/r44150][ENH] Explicitly set the IIS7 maxAllowedContentLength, which is one components which limits the max file size during uploads.
Users can now adjust this value easier. This component is currently *not* a part of the calculation: max file upload size, presented to users in the upload panel.
When installing the IIS maxAllowedContentLength is set to 30MB, which is IIS default. IIS installation which already have adjusted this value at IIS server level, must adjust the new web.config value accordingly.