Imio.pyutils

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- Added `utils.time_start` and `utils.time_elapsed` to print elapsed time from start.
Intended to be easily used when debugging...
[sgeulette]

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- Added `utils.append` to append a value and return it.
[sgeulette]

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- Added `utils.get_clusters` to display a list of number grouped by clusters.
[gbastien]

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- Added `utils.merge_dicts` to be able to merge several dicts for which values
are list, list are extended in final result.
[gbastien]

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- Modified `memory` to return more useful information.
[sgeulette]

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- Added `process_memory` to return current process memory.
[sgeulette]
- Added `memory` to return RAM information.
[sgeulette]