deprecate lazy-catch

deprecate lazy-catch

* libguile/deprecated.h:
* libguile/deprecated.c (scm_internal_lazy_catch, scm_lazy_catch):
  Deprecate, and print out a nasty warning that people should change to
  with-throw-handler.

* libguile/throw.h:
* libguile/throw.c (scm_c_with_throw_handler): Deprecate the use of the
  lazy_catch_p argument, printing out a nasty warning if someone
  actually passes 1 as that argument. The combination of the pre-unwind
  and post-unwind handlers should be sufficient.

* test-suite/tests/exceptions.test: Remove lazy-catch tests, as they are
  deprecated. Two of them fail:
  * throw/catch: effect of lazy-catch unwinding on throw to another key
  * throw/catch: repeat of previous test but with lazy-catch
  Hopefully people are not depending on this behavior, and the warning is
  sufficiently nasty for people to switch. We will see.

* test-suite/tests/eval.test ("promises"): Use with-throw-handler
  instead of lazy-catch.

* doc/ref/api-debug.texi:
* doc/ref/api-control.texi: Update to remove references to lazy-catch,
  folding in the useful bits to with-throw-handler.