Fix LSTM ONNX compatibility

Minor fixes related to #167.

• Add forcedInputsCategory attribute to MetaOperator, which allows to change the input category of the meta op inputs (which should not necessarily inherits from its inner nodes). Example: the meta op input should be a Param category but this input goes to a Squeeze operator inside the meta op. If inherited, the input category would be Data instead of Param.
• Added binding for set_upper_node.
• Fixed bug in GraphView::save().
• Changed behavior of Scheduler to initialize the consumer list to the output nodes.

requested review from @hrouis

assigned to @olivierbichler

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• e40c85bb - Added binding for setUpperNode

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• e40c85bb...55dc82b0 - 43 commits from branch dev
• bc7e4340 - Merge branch 'backend_export' into fix_lstm

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• 0a40c485 - 1 commit from branch dev
• 739977cd - Merge branch 'dev' into fix_lstm

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• 739977cd...f5ed784f - 6 commits from branch dev
• 9b1cdc6e - Merge branch 'dev' into fix_lstm

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• a8dfbe30 - Added meta op input category

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added 1 commit

• 8c3215f8 - Scheduling should start from outputs, not inputs

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added 23 commits

• 8c3215f8...bb4c8f50 - 19 commits from branch dev
• 52524547 - Various fixes
• 98b01f7e - Added binding for setUpperNode
• b12c9395 - Added meta op input category
• dd911b67 - Scheduling should start from outputs, not inputs

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added 9 commits

• dd911b67...4555ef26 - 5 commits from branch dev
• edd81130 - Various fixes
• 2abb961c - Added binding for setUpperNode
• 3ba465b3 - Added meta op input category
• e3d14f15 - Scheduling should start from outputs, not inputs

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approved this merge request

mentioned in commit 894d4894

merged

mentioned in issue #185