Fix #903 Create StaticTransform, Frame.getStaticTransformTo, and supporting methods

Closes #903

See merge request orekit/orekit!249

For #903

In staticShiftedBy(...) use positionShiftedBy because it is slightly
more efficient than shiftedBy(...).

For #903

More efficient if null rotations and translation do not have to be
accounted for.

For #903

For #903

Added a specializaiton of the method where it would seem to provide some
benefit and it was not too complex to do so.

For #903

When transforming a line keep its tolerance for the newly created line.
Perform slightly fewer computations when transforming a line.

For #903

Where appropriate, replace getTransformTo with getStaticTransformTo to
improve performance.

For #903

Fixed unmanaged comment in OMM

See merge request orekit/orekit!248

Also implemented other sifted by methods used by
ShiftingTransformProvider so that only rotation and translation is
computed. Speed up of an additional ~1.2.

Also added some tests.

For #903

Also added tests. Results in an additional speed up of 1.2 due to not
computing LOD.

For #903

StaticTransform is a new interface that only include information for
transforming positions and directions. Transform is a subtype.

Added a getStaticTransform() method to Frame. Some preliminary testing
has shown a speed up of 1.5 compared to using getTransform() when
transforming positions. This is because StaticTransform.combine(...) can
ignore all the velocity and acceleration terms. (And that Orekit is very
good at caching frame transforms so the full precession model is rarely
evaluated.)

Also added some missing methods to make Transform.IDENTITY more
efficient.

Also added some tests.

For #903

Fixed unmanaged units in OMM

See merge request orekit/orekit!247

Issue 698

See merge request orekit/orekit!246

Lars Næsbye Christensen authored Mar 16, 2022 and Bryan Cazabonne committed Mar 16, 2022

Fixes #896

Add git config instructions

Closes #896

See merge request orekit/orekit!245

Fixes #896

Fixes #894