Closes #1753

fix: change `self:update` to `self update` in docs and add hint about different syntax in earlier version (#1712)

* fix (locker): add `develop = false` in `poetry.lock` if set in `pyproject.toml`
fix (locker): read `develop` value from `poetry.lock` so it is respect when exporting to `requirements.txt`

* fix (test_installer): adopt expected result

* change (test_installer): move develop key from source to package in lock file

* fix (test_installer): make black happy

* do not write empty or any markers

* Update poetry/version/markers.py

Co-Authored-By: Sébastien Eustace <sebastien.eustace@gmail.com>

* Update test_markers.py

Fix typo + reformat help in LockCommand

added install instruction for powershell users

Fix README(Documentation)

* fix: success message by `poetry new` now shows correct package name if it was automatically renamed

* fix: revert isort changes

* FIX: To find excluded files, no additional glob is used to build a complete list of excluded files. Instead when checking if a file is excluded, it is looked up if one of the parent folder is in the excluded list.

* making isort happy

* revert accidentally made changes to pyproject.toml/poetry.lock

* fix: change condition for breaking loop, as previous version could lead to infinite loop

* Make index urls a set to avoid exporting duplicates to requirements.txt

Fixes #1434

* Add test for deduplication of sources in exporter

* Holy test names, blackman.

* Sort indexes for consistent output with multiple extra indexes

Set mtime on setup.py/PKG-INFO when building sdist