* files.el (file-remote-p): Introduce optional parameter CONNECTED.

* files.el (file-remote-p): Introduce optional parameter CONNECTED.

* net/tramp.el:
* net/tramp-ftp.el:
* net/tramp-smb.el:
* net/tramp-uu.el:
* net/trampver.el: Migrate to Tramp 2.1.

* net/tramp-cache.el:
* net/tramp-fish.el:
* net/tramp-gw.el: New Tramp packages.

* net/tramp-util.el:
* net/tramp-vc.el: Removed.

* net/ange-ftp.el: Add ange-ftp property to 'start-file-process
(ange-ftp-file-remote-p): Handle optional parameter CONNECTED.

* net/rcompile.el (remote-compile): Handle Tramp 2.1 arguments.

* progmodes/compile.el (compilation-start): Redefine
`start-process' temporarily when `default-directory' is remote.
Remove case of synchronous compilation, this won't happen ever.
(compilation-setup): Make local variable `comint-file-name-prefix'
for remote compilation.