Fixes for interactive control:

Fixes for interactive control:

- callgrind_control was not working, because it checks the
  "command syntax version" to be at most 1 before doing anything.
  But callgrind used Valgrinds version for this (3.2.0). Now we
  define a separate version COMMAND_VERSION for the syntax format
  of control and result files.
  Strictly, such a version is not needed for interaction of
  callgrind and the script callgrind_control itself, as they are
  delivered in the same package. But there are also external
  controlling tools (most notable KCachegrind)

- Some systems make it difficult for callgrind_control to
  automatically detect running callgrind processes. To make
  interactivity work, one has to provide the cwd with -w.
  For commands expecting a result from callgrind, this result
  was delivered in the wrong result file.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@5861