Update example C client application to match various recent API changes. Minor refactoring of line reading code.
Update example C client application to match various recent API changes.
Minor refactoring of line reading code.

Patch by: Martin Furter <mf@rola.ch>
          me

* tools/examples/minimal_client.c
  (my_prompt_callback): removed
  (prompt_and_read_line): new function.
  (my_simple_prompt_callback): new function.
  (my_username_prompt_callback): new function.
  (main): pass new callbacks where appropriate, and use the updated
   svn_config API.

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