cotangent -> middle in docu
include DefectClasses_code
added comment in method for DefectClasses
in docu: method for DefectClasses implements [GM00, Lemma 2.1]
include DefectGroup_code
better comments in CentralIdempotentsOfInvolutiveAlgebra
sectioning in Algebras.gi
corrected sectioning in Groups.gi
content of Modules.g? is now appears in @Chapter Tools
added missing @Arguments
declared NormalizedUnitaryGroup for IsGroupRing instead of IsRing
renamed NaiveSizeOfUnitaryGroupOfGroupRing ->

ExpectedSizeOfUnitaryGroupOfGroupRingOf2Group
moved declarations/installations from Algebras.g? -> Blocks.g?

namely:
. UnderlyingGroupAlgebra
. UnderlyingBrauerTable

BlockOfIdempotent is now an declared as an attribute
organized order of chapters in doc/Intros.g

(thanks Sebastian Gutsche)
replaced RadicalOfAlgebraPowersAsIntersection by RadicalOfAlgebraPowers

in DefiningIdealOfLowerPartOfUnitaryGroup as the former could become too expensive
and has no advantage here