slonik_execute_script has a "-c" option to give a single command to run
on the command line, which is convenient.

I ran something like this:

slonik_execute_script -c 'ALTER TABLE a RENAME to b' set3 | slonik

This silently failed. Slonik accepted the command, but nothing happened.
The reason is there is no trailing semicolon, so slonik interpreted this
as "0 commands".

I addressed this in the script by adding a trailing semicolon if there
is not one given with the "-c" option.

However, I think "slonik" should also be updated to at least provide a
warning if it receives "0 commands" to process.

   Mark
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