let g_warn_if_fail replace g_assert

hey All.

proposing to turn g_asert into a warning:
was obviously not perceived too well.

as i read it, most people are not against my basic
reasoning, but are clearly in favour of adding
g_warn_if_fail or a similar variant thereof.

so i'd like to change course and suggest we do this:

- add g_warn_if_fail (condition); which produces a critical
  warning about failing assertions but contrary to g_assert

- extend the g_assert() docs to note that:
  1) programmers are more likely to want to use g_warn_if_fail instead
     (particularly for libraries, allthough the destabilizing effects
     of g_assert are also worth avoiding in applicaiton code);
  2) for code portions that positively have to rely on program
     termination, only g_error() will deterministically achive that.

- proceed analogously for g_warn_if_reached() and g_assert_not_reached().

comments apprechiated, particularly on the new function names.


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