Attractor-Cycle Notation

BREAKING CHANGES: ContainsSet(sk, P) replaced with P in ExtendedImageSet(sk), since ExtendedImageSet is now a HashSet for faster lookup.
SortedExtendedImageSet added for retaining the functionality of having a sorted list of the extended images.
CompactNotation has different semantics now and it is renamed to AttractorCycleNotation. LinearNotation has been removed.

Other changes:
DotTransformation added.
ComputeSkeletonNavigationTables added. This replaces the previous caching mechanisms. With this all skeleton navigation functions can be precomputed.

Changing representative sets

MakeRepresentative added.

Essential dependencies

Preliminary functions for finding essential dependencies added. Skeleton code partially revised and simplified.

GAP 4.12 compatibility release

Due to an upstream change in the Semigroups package older versions are not working with GAP 4.12, hence the new release.
For GAP 4.11, SgpDec v0.9.3 is the last working release.

Removing the star state

The star state was added previously to explicitly represent the situation where the cascade action 'jumps over' some levels. However, the extra states unnecessarily increase the size of the component state sets, leading to bigger decompositions. This release removes the star state and uses the constant 1 map as the default component action. Thus, the decompositions will be smaller.

v0.9.2 Usability improvements for group decompositions

Making FL conversion functions polymorphic, so they can either take an FLCascadeGroup for convenience, or a list of transversals if obtaining a decompositions (lifting the generators) is not feasible.

v0.9.1 improvements in group decomposition

Separating computation of transversals and component groups into different functions: FLTransversals, FLComponents. This is useful for computing decompositions partially, in case the whole FLCascadeGroup is not feasible. ValidPoints is now defined as an attribute of FLCascadeGroup to avoid recalculation. Standard way of testing with TestPackage("sgpdec") is available now.

v0.9 `Monday morning in Waterloo' release

This release closes down a week long intensive development cycle. SgpDec now has 95% code coverage by tests and substantial amount of added documentation (though still unfinished). This release is recommended for classroom use.

New visualization functions for holonomy groups

This release starts a code freeze period. Only documentation will be added for the next stable release.

Wreath product fix

Full cascade semigroups do not have 'ghost' elements anymore as a result of registering identities as dependencies.