Pyppl

- Add check for output names
- Fix deepcopy problem in proc.copy
- Remove template functions, as they are not necessary for the framework itself
- Add keys in kwargs of Proc construct in sets
- Fix other bugs

- Add forced cache 78
- Add CLI hooks for plugins
- Fix job not submitting while retrying

- Optimize CLI "pyppl list/clean" to show results immediately instead of loading all processes.
- Fix CLI option "-before" validation.
- Fix error when some objects cannot be deeply copied while coping a process.
- Fix while in job names for sge runner.
- Use TEMPDIR instead for _fsutil to avoid creating a subdirectory under it threading-unsafely.
- Enhance if some SGE fails to generate stdout/err file.

- Rename plugins from pyppl-* to pyppl_* due to inability of dashes in entry_point

- Save 'var' type of input as string to avoid error when reading it
- Report plugin version in logger

- Drop proc.tplenvs, use proc.envs instead