Drop inferring version to install from `pyenv local`

Create mambaforge-4.10.1-4

Change `done` to `fi` since otherwise Bash emits an unexpected token error:

```
bash: /home/foo/.bashrc: line 120: syntax error near unexpected token `done'
bash: /home/foo/.bashrc: line 120: `if command -v pyenv >/dev/null; then eval "$(pyenv init -)"; done'
```

Add explicit Zsh instructions for MacOS

Indirect ones with errata have proven to confuse users.
Fixes #1947, #1948

install pip with pyston

The default pyston build do not have pip installed by default. This change just add `get_pip` function to have pip installed.

Mention log file if an error happened before building, too

Add pypy3.7-7.3.5, pypy3.7-7.3.4-src, pypy3.7-7.3.5-src

Report cache filename at download

* Added Stackless 2.7.16

Co-authored-by: Nathan <nathan@nathan.v>
Co-authored-by: Ivan Pozdeev <vano@mail.mipt.ru>

Prevent build from installing MacOS apps globally

ldflags_dirs is not needed for Python and causes failures

Update anaconda3-2021.05 - fixed checksum for macOS package

Fixed checksum for macos package

Ensuring that all dirs in LDFLAGS exist is only needed for Ruby due to its `configure` requirements.
If some LDFLAGS entries point to a nonexisting path to which the user doesn't have permission. this causes a build failure.

The $(type -p | head -1) construct expects to always get a path, so need to ignore such aliases with -P

Closes https://github.com/pyenv/pyenv/issues/1662

E.g. "*-latest"
May need splitting into project-specific ones if there emerge projects with different check needed

Closes https://github.com/pyenv/pyenv/issues/1559

Create miniforge3-4.10.1-1

Make test independent of umask

Bash automated install option for the case when ~/.profile sources ~/.bashrc

* Update install instructions for Bash and Zsh

* Synchronize README.md with `pyenv init`
* Add a ~/.bash_profile note
* Concatenate shims activation into installation for brevity
  (Pyenv can't be used meaningfully without shims anyway)
  Otherwise, we'd need to duplicate all the ~/.profile shenanigans in both sections
* Update based on feedback
* Proofread

Add a hint for cases when ~/.profile sources ~/.rc

Our ~/.rc logic must run after the ~/.profile one

Place full shell configuration instructions into `pyenv init`

including initial PATH and PYENV_ROOT entries.
The migration hint proved to be unclear to users without them.