Homogeneize Allen configuration

• All Allen python configuration files are now installed.
• The import of algorithms.py and the import of generator.py are now dispatched based on is_allen_standalone(). The behaviour of it can be overriden if needed.
• Allen generated algorithms are now installed when compiled as part of the stack as well.
• A new configuration function allen_register_keys() has been added to deal with the generation of keys in decreporter. Its behaviour can also be overriden.
• .json configuration files cannot be generated at compile time anymore. Instead, they can be generated at runtime always even if invoking from Gaudi.

All the above allows the Allen configuration to be generated once that Allen is compiled in the stack.

Should go with MooreOnline!163 (merged)

mentioned in issue #366 (closed)

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• 62ce0ad4 - Fixed formatting
• bc97ccc9 - Added license.

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• cf363a5b - Fix configuration options include from persistency.py.

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• 4386da8c - Fix standalone build.

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• 8cd45b4f - Remove generate_script.sh.in.

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• 9e51ae92 - Set standalone to 1 when generating configurations.

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• d443d01a - Set LD_LIBRARY_PATH always.

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• 74d58178 - Remove generation of options at compile time.

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• 2528f10c - Generate sequence as part of allen.py.

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• f7f9df81 - Fixed formatting

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Let's run a first round of tests:

/ci-test

changed title from WIP: Homogeneize Allen configuration to Homogeneize Allen configuration

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• [2022-10-03 14:06] Validation started with lhcb-master-mr#5820
• [2022-10-10 16:33] Validation started with lhcb-master-mr#5873

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• 547a6a46 - Simplify allen configuration options using boolean ones.

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• e5e00d3e - Fixed formatting

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