[SciPy-Dev] Deprecation of `stats.betai` and `stats.chisqprob`

[Abraham Escalante]

Hello all,

In continuing with the statistics module cleanup `stats.betai` and
`stats.chisqprob` were identified as candidates for deprecation. These
functions are basically just aliases, delegating to `special.betainc` and
`special.chdtrc` respectively.

In accordance to gh-2741, the preferred way to use these distributions is
via the corresponding `stats.distribution` function or by calling the
`scipy.special` function directly.

If there are any objections to deprecating these functions, please voice
them here so we can ponder and make a decision.

For more details refer to the following issues:

   - gh-2741 <https://github.com/scipy/scipy/issues/2741>
   - gh-641 <https://github.com/scipy/scipy/issues/641>
   - gh-642 <https://github.com/scipy/scipy/issues/642>

For details on the PR refer to:

   - gh-5017 <https://github.com/scipy/scipy/pull/5017>


Cheers,
Abraham.
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