Fixes #867

Fixes #653

Fixes #848

Thanks to Sofia Urbina for the translation!

Thanks to Sofia Urbina for the translation!

Anne-Laure did most of the work to add more informative messages when
root finding for event detection fails. This commit adds a few polishes.
- Added Anne-Laure Lugan as a contributor
- Updated messages to print g values to full precision.
- Made try {} as small as possible since catch() is so broad
- Fix checkstyle warnings
- Add test to check message is formatted correctly

Improve exception messages with AbsoluteDates by including the duration
between the dates. Many messages updated, some new messages added.

Part of #825

Fixes #809

Fixes #782

This change is for consistency with Orekit conventions.

The parser should handle poperly some funny specifications like:

 MHz, km/√d, kg.m.s⁻¹, µas^(2/5)/(h**(2)×m)³, km/√(kg.s)