v2.5.4

• Some functions accept slightly more general input. For example, it
  is now in some cases acceptable to use finite field elements like
  Z(4)^0 (which is equal, but not identical, to Z(2)^0) as input when
  cvec is expecting elements of GF(2).
• Fix EmptySemiEchelonBasis: its documentation said it expects a
  sample vector, but the implementation expected a sample matrix. Now
  both are possible, and both are documented.
• Fix some errors in the manual.
• Move website to http://gap-packages.github.io/cvec/
• Stop using GenericHashFunc_C (formerly provided by the orb package)