instead of lspace_master

[affeldt-aist]

Motivation for this change

Closes #1506

I wasn't able to rebase, hence the new PR closing the old one. @hoheinzollern @CohenCyril @proux01 @t6s

Checklist

• added corresponding entries in CHANGELOG_UNRELEASED.md

• added corresponding documentation in the headers

Reference: How to document

Merge policy

As a rule of thumb:

• PRs with several commits that make sense individually and that
  all compile are preferentially merged into master.
• PRs with disorganized commits are very likely to be squash-rebased.

Reminder to reviewers

• Read this Checklist
• Put a milestone if possible
• Check labels

[affeldt-aist]

The last commit renames the HB structure Lfun to Lfunction. There is no impact
on scripts but lets us write \in Lfun instead of \in lfun as we did so far.
The type remains LfunType (this is similar to the contraction of zmodType for Zmodule).

[CohenCyril]

I think the issues about the conjugate should be solved before merging.

[CohenCyril]

Suggested change

	Definition conjugate :=
	Definition hoelder_conjugate :=

[affeldt-aist]

CI is green