regular expression matching can now be reliably interrupted using CTRL+CHEADmaster-fmsbw-cimaster

* The previous checks for interruptions only helped in a few corner cases
  like for very high search-repeat counts or during backwards searches across
  the entire buffer.
* But even with terex' more predictable runtime properties
  a single regex execution can hang quite a long time.
  E.g. `S^EM^X$` on a huge buffer or even more so with backreferences as in
  `S^~(.*)\1$`.
* We now use the new tere_set_is_interrupted_cb() to register
  teco_interface_is_interrupted(). Types should be compatible as long
  as gboolean resolves to int.
* It's no longer necessary to manually check for teco_interface_is_interrupted()
  since tere_exec() now returns REG_EINTR in case the callback returned TRUE
  in which case it's handled by teco_error_regex_set().

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