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Bumps [pip](https://github.com/pypa/pip) from 20.0.1 to 21.1.
- [Release notes](https://github.com/pypa/pip/releases)
- [Changelog](https://github.com/pypa/pip/blob/main/NEWS.rst)
- [Commits](https://github.com/pypa/pip/compare/20.0.1...21.1

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Bumps [babel](https://github.com/python-babel/babel) from 2.9.0 to 2.9.1.
- [Release notes](https://github.com/python-babel/babel/releases)
- [Changelog](https://github.com/python-babel/babel/blob/master/CHANGES.rst)
- [Commits](https://github.com/python-babel/babel/compare/v2.9.0...v2.9.1

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Bumps [lxml](https://github.com/lxml/lxml) from 4.4.2 to 4.6.5.
- [Release notes](https://github.com/lxml/lxml/releases)
- [Changelog](https://github.com/lxml/lxml/blob/master/CHANGES.txt)
- [Commits](https://github.com/lxml/lxml/compare/lxml-4.4.2...lxml-4.6.5

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Bumps [pyyaml](https://github.com/yaml/pyyaml) from 5.1.2 to 5.4.
- [Release notes](https://github.com/yaml/pyyaml/releases)
- [Changelog](https://github.com/yaml/pyyaml/blob/master/CHANGES)
- [Commits](https://github.com/yaml/pyyaml/compare/5.1.2...5.4

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Bumps [pillow](https://github.com/python-pillow/Pillow) from 8.1.0 to 9.0.1.
- [Release notes](https://github.com/python-pillow/Pillow/releases)
- [Changelog](https://github.com/python-pillow/Pillow/blob/main/CHANGES.rst)
- [Commits](https://github.com/python-pillow/Pillow/compare/8.1.0...9.0.1

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Bumps [pyspark](https://github.com/apache/spark) from 2.4.4 to 3.1.3.
- [Release notes](https://github.com/apache/spark/releases)
- [Commits](https://github.com/apache/spark/compare/v2.4.4...v3.1.3

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Bumps [pyjwt](https://github.com/jpadilla/pyjwt) from 1.7.1 to 2.4.0.
- [Release notes](https://github.com/jpadilla/pyjwt/releases)
- [Changelog](https://github.com/jpadilla/pyjwt/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/jpadilla/pyjwt/compare/1.7.1...2.4.0

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KNOWAGE-6894
KNOWAGE-6895
KNOWAGE-6896
Data Preparation implementation should be fully finished now, it needs to be confirmed working on latest1 because we dont have spark on our local env.

KNOWAGE-7111
Added an additional check inside Metaweb.

KNOWAGE-7114
Implemented custom formulas as requested inside Metaweb and QBE.
Changed KnCalculated field so it reads formulas from a property instead a descriptor, a new required property propCalcFieldFunctions needs to be passed to the component.

Possible bugfix: KNOWAGE-7103

Bugfix: KNOWAGE-7105

Merge branch 'sprint-15-bugfix' of https://github.com/vstanojevic/Knowage-Server into sprint-15-bugfix

Bugfix KNOWAGE-6958

Bugfix:

KNOWAGE-7115
KNOWAGE-7109