…@, @> and <@.

Fix bug that would turn operators @@, @> and <@ in ::, :>, and <: respectively.
Add tests for said operator butchery.

Remove a couple bits of redundant and ineffective code in the scanner.

Add test to demonstrate the parameter rename bug that exists with the new hash-based parameter lookup.

Make parameters aware of their owning collection.
Enforce a parameter can belong to any collection only once.
On paremeter name change, invalidate owning collections's hash lookups.
When a parameter's collection changes, also make sure it is marked as unbound.
Add function to remove a parameter by name.

Send SET command_timeout = <timeout> to backend when needed.
Extend the Socket.Poll() timeout by 5 seconds to try and guarantee that the backend's timeout error will occur before the frontend's timeout does.

(npgsql@6e32569)

After adding the root namespace, Npgsql Entity Framework xml files
weren't being found anymore. This patch fixes the name of those ids used
to find the files inside Npgsql assembly.

Thanks jjchiw for the patch:
jjchiw@409a820

Only applied the part about NpgsqlProviderManifest.cs file.

Titles and copyright

… release-2.1.0

… always honored

Fix NpgsqlCommand not always picking up the AlwaysPrepare connection string option.

…mmand.Rewrite

isFirstOutputOrInputOutput was declared within the loop, needed to be moved out.