Imio.pyutils

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- Nothing changed yet.

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- Added a new helper `utils.get_ordinal_clusters` to cluster ordinal numbers based on an offset.
[aduchene]

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- Added patterns parameter in `system.read_dir_filter`.
[sgeulette]
- Returned original filename in `system.hashed_filename` if string to hash is empty.
[sgeulette]

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- Require `six>=1.16.0`.
[sgeulette]
- Added `system.hashed_filename` to get a new filename differentiated by a hashed string.
[sgeulette]

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- Handled set in `load_var`.
[sgeulette]
- Added `load_pickle` and `dump_pickle`
[sgeulette]
- Improved `bs.is_empty`
[sgeulette]

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- Made py2 and py3 compliant
[sgeulette]
- Improved `utils_safe_encode`
[sgeulette]
- Added `bs.is_empty` function.
[sgeulette]
- Added `bs.remove_some_childrens` function.
[sgeulette]
- Added `bs.replace_strings_by_pattern` function
[sgeulette]
- Added `exclude_patterns` parameter in `system.read_recursive_dir`
[sgeulette]