change bandwise metadata keys

[Andreas Rabe]

As discussed with the team: use the exact keys for band-wise metadata as used by ENVI domain.

E.g. don’t use “bad_band_multiplier“ but “bbl”

• change API
• change Glossary

‌

[Benjamin Jakimow]

resolves #1096, closes #1088, addresses #1095, resolves #1101, addresses #1102

→ <<cset 80696482d3e2>>

[Andreas Janz]

resolves #1095

→ <<cset 03e144d8d0ce>>