Merge pull request #2 from sebasguts/master

ToDoListEntries
IsHomalgRing now lies in the filter IsRingWithOne

comply with MatricesForHomalg v2013.04.15
simplified code of PrimaryDecomposition

and removed duplicate method in Modules.gi
coding style
declared and installed the attribute RadicalDecomposition

for matrices and modules

+ AMaximalEnvelopingIdeal now uses RadicalDecomposition
  instead of PrimaryDecomposition
renamd AMaximalEnvelopingIdeal -> AMaximalIdealContaining
installed DecideZero for ring elements modulo ideals
added support for IsBound( RP!.AffineDimensionOfIdeal ) and NrColumns( M ) = 1

now we are at least able to compute dimensions of cyclic modules in MAGMA
Installed RankOfObject, ChernPolynomial for ChernCharacters
Merge pull request #3 from sebastianpos/master

ChernCharacter
increased version
Fixed a bug

which causes automatic computation of factorobjects.