Add remote backup functionality

Create wrapper functions that take a host and a function with named
arguments.  The supplied function is the to be executed on the
specified host, which may be the empty string signifying local
execution.

These wrapper functions essentially export the to be run function and
any of its recursive dependencies, further the named arguments as
variables, to the remote host, and run the function remotely.  That is,
if the host is non-local.

Also,
- use appropriate function names to differentiate between destination
  and source host wherever applicable.
- add comments,
- enhance TODO and README,
- rename some variables in order to increase consistency,
- move some global declarations further upward,
- make variables readonly when reasonable,
- use named return and exit codes,
- add a general `ask'-function.

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