Scriptengine

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Features
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- Add coverage+coverall to CI (72)
- Add badges to README (72)

Fixes
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- Fix 74: base.find correct update context

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Features
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- Fix 71: Add Jinja2 filters 'exists' and 'path_join' (thanks jmrgonza)
- Add documentation for SE filters for Jinja2

Fixes
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- Fix 66: Some fixes and completions to documentation (thanks mandresm)

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Fixes
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- Fix 68: Saving stderr/stdout from base.command fails in jobs
(thanks jmrgonza for reporting)

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Fixes
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- Fix 64: deepdiff 6.2.1 breaks base.context with rrules
(thanks madnresm and JanStreffing for reporting)

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Fixes
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- Fix 59: loop on strings tuple not working as expected
- Fix 61: base.getenv not returning context update

Internal changes
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- Some refactoring in job loop code
- Some refactoring in Include task code

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Fixes
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- Fix 58: SE installation error