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Co-authored-by: Lijiao <15910218274@163.com>

Co-authored-by: Lijiao <15910218274@163.com>

* Disable precondition check for length in export for PDARTS

* update

Co-authored-by: Lijiao <15910218274@163.com>

As requirement of #2390 , removed multiphase from WebUI, document, and put all trials flatten on WebUI.

1. The major change is to split trial-jobs to trials in webui, and use parameter id as part of trial id.
2. If multiphase is enabled, the limitation of trial controls job count only, not trials actually.
3. When multiphase enabled, the trial status may not be right. Previous trials in a job will be marked as success, only last trial presents the job's status.
4. multiphase related documents and UX are removed.

minor changes,
1. Update dev document for webui development.

update nni manager eslint rules.

1. add rule to ignore unused args, and treat other unused as error.
2. add run to treat no explicit function return type as error.
3. fix all errors.

To support Windows node in remote mode, this PR adds a layer of commands (osCommands) to deal difference between Windows and Unix-like OS. To share code, ShellExecutor is added to enrich original SshClient class.

I will implement windows version commands in next phase.

This pattern can be expanded to Local or other platform in future, so I moved related code to common folder for sharing.

Add shell support for ssh connection, so that remote script can be started with user environment.

Minor fixes,

1. Fix gpu_metrics_collector to support pyenv. As pyenv will create one more process, so that original pgrep code always got extra processes, and cannot start gpu_metrics_collector.
2. Fix NASUI failure on dev-install-node-modules, to create subfolder every time.
3. Fix MakeFile to reduce mis-created links, and other minor issues.
4. Add node --watch for nni_manager for better dev experience.

Bumps [acorn](https://github.com/acornjs/acorn) from 6.4.0 to 6.4.1.
- [Release notes](https://github.com/acornjs/acorn/releases)
- [Commits](https://github.com/acornjs/acorn/compare/6.4.0...6.4.1

)
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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* support final result is NaN in webui

* delete unuseful change

* show NaN rather than NaN(latest)
Co-authored-by: Lijiao <15910218274@163.com>

* add warning message when final data illegal

* update

* update

* update

* fix comments
Co-authored-by: Lijiao <15910218274@163.com>