Fast-oad

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- Fixed:
- Fixed backward compatibility of bundled missions. (466)

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- Changed:
- Added a new series of tutorials. (426)
- Enhancements in mission module (430 and 462), mainly:
- a parameter with a variable as value can now be associated to a unit and a default value that will be used in the OpenMDAO input declaration (and be in generated input data file).
- a target parameter can be declared as relative to the start point of the segment by prefixing the parameter name with "delta_"
when setting a parameter, a minus sign can be put before a variable name to get the opposite value (can be useful with relative values)
- a parameter can now be set at route or mission level.
- dISA can now be set in mission definition file with isa_offset.
- a mission phase can now contain other phases.
- if a segment parameter (dataclass field) is an array or a list, the associated variable in mission file will be declared with shape_by_conn=True.
- taxi-out and takeoff are no more automatically set outside of the mission definition file:
- mission starting point (altitude, speed, mass) can now be set using the "start" segment.
- the mass input of the mission can be set using the "mass_input" segment. This segment can be anywhere in the mission, though it is expected that fuel consumption in previous segments is mass-independent.
- if none of the two above solution is used to define a mass input variable, the mission module falls back to behaviour of earlier releases, i.e. the automatic addition of taxi-out and takeoff at beginning of the mission.
- Upgrade to wop 2.x API. (453)

- Fixed:
- Variable viewer was showing only one variable at a time if variable names contained no colon. (456)
- Optimization viewer was handling incorrectly bounds with value 0. (461)

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- Fixed:
- Deactivated automatic reports from OpenMDAO 3.17+ (can still be driven by environment variable OPENMDAO_REPORTS). (449)
- Mass breakdown bar plot now accepts more than 5 datasets. The used color map is now consistent with othe FAST-OAD plots. (451)

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- Fixed:
- FAST-OAD was quickly crashing in multiprocessing environment. (442)
- Memory consumption could increase considerably when numerous computations were done in the same Python session. (443)
- Deactivated sub-models kept being deactivated in following computations done in the same Python session. (444)

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- Fixed:
- Fixed crash when using Newton solver or case recorders. (434)
- DataFile class enhancement (435) :
- Instantiating DataFile with an non-existent file now triggers an error.
- DataClass.from_*() methods now return a DataClass instance instead of VariableList.
- A dedicated section has been added in Sphinx documentation (General Documentation > Process variables > Serialization > FAST-OAD API).
- A component input could be in FAST-OAD-generated input file though it was explicitly connected to an IndepVarComp output in configuration file. (437)

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- Fixed:
- Compatibility with OpenMDAO 3.17.0. (428)