[+API] FLOW3 (Utility): Added detectBaseUri() to Environment. Given an URI instance it tries to detect the corresponding base URI.
[+API] FLOW3 (Utility): Added getScriptRequestPath() to Environment, returns the path to the actual script request relative to the document root.
[~API] FLOW3 (Utility): Renamed getScriptRequestPathAndName() to getScriptRequestPathAndFilename() in Environment.
[~TASK] FLOW3 (MVC): Reverted recent change by Robert related to request path handling, relates to #6596
[~TASK] FLOW3 (Utility): Some more changes to getRequestUri() in Environment, relates to #6596, relates to #3029, relates to #3375.
[~TASK] FLOW3 (Resource): Make use of new getScriptRequestPath() method in FileSystemPublishingTarget.