correctly deal with empty list of indeterminates

in ParseListOfIndeterminates and fallback method for PolynomialRing
"endomorphism" -> endo"morphism"
declared and installed CoefficientOfUnivariatePolynomial
Declared & installed Value for HomalagRingElements
added Vinay as author
default to TryNextMethod in method for Coefficients
Updated Value method for multivariable substitution
Merge pull request #8 from wagh/temp

Updated Value method for multivariable substitution
CreateHomalgRing now accepts a list of "finalizer" functions
declared AddRationalParameters
declared and installed UnivariatePolynomial for a (coefficients) list and a string
installed \* between FFEs and homalg ring elements
coding style
declared and installed FFEToString
fixed an error in a SetRingProperties method
installed a new method for SetRingProperties

for [ IsHomalgRing and IsFieldForHomalg, IsInt, IsInt ] = [ GF(c^d), c, d ]
HomalgRingOfIntegers now supports finite fields

+ updated method for RingName accordingly
+ declared and installed GetListListOfStringsOfHomalgMatrix
  which deals with finite fields and used it to simplify and improve
  GetListListOfHomalgMatrixAsString
declared and installed Homogenization for ring elements

upon Thomas Bächler's request

18:26:33 Thomas Bächler: baust du mir ein homogenize?
18:26:38 mohamed.barakat: ja, mache ich
18:26:38 Thomas Bächler: den rest krieg ich hin