Adding yzokras as maintainer.

See merge request !13

change all occurrences of old gitlab repo URL

See merge request !12

Upgrade to Orekit 12.1.1, Hipparchus 3.1, Rugged 4.0-SNAPSHOT

See merge request !11

Caution, they are generated by a modified jpype version which fixes the parsing of HTML files from Javadoc 17, but it is not merged yet: https://github.com/jpype-project/jpype/pull/1200

To track Orekit java version 12.1.1

make setup_orekit_data more robust

Closes #1

See merge request Petrush/orekit_jpype!10

Minor improvements for release process

See merge request Petrush/orekit_jpype!9

and add Python 3.12 compat explicitly

- use official Python Debian docker images instead of custom images
- jdk4py is now used instead of installing openjdk on linux
- A matrix of several Python versions (3.9 to 3.12) is used for testing
- add build stage which tries building the python wheel (available for one day as an artifact)
- add flake8 step in test stage to lint the code and produce a code quality report (available as an artifact)
- the test step now also computes the test coverage (available as an artifact)

for instance from jdk4py, without having to use a JAVA_HOME environment variable

- test orekit_converters.py
- test pyhelpers.py
- test orekit_jpype.py
The tests that start the JVM are split into several files meant to be run separately because the JVM cannot be restarted (known jpype/JNI limitation)

- Maven allows downloading JARs (it now only requires changing the Orekit or Hipparchus or Rugged version in pom.xml)
- Javadoc JARs are only required for generating stubs, so they don't need to be packaged. This reduces the wheel size by more than half

add CI pipeline

See merge request Petrush/orekit_jpype!8

add hook to make orekit_jpype pyinstallable

See merge request Petrush/orekit_jpype!6

 using a docker image from the ci-utils repo ci-utils!3

I had an error complaining that numpy was not found, and is needed for the helper functions which convert arrays.