fixed bug in transext.cc
fixed some minor bugs in ellipticcovers.lib
update to test files for  ellipticcovers.lib
fix: enforce integer coeffs in rational functions
fix: better readability of version string
fix: correct test result
fix: test results
fix: test result
fix: test results
removed rField_is_Extension (alg. or trans. ext. ?)
fix: delete DEN if it is 1
Merge pull request #363 from mmklee/den

fix: delete DEN if it is 1
fix: correct usage of ..Alloc0Bin..
removed rIsExtension
Merge branch 'spielwiese' of https://github.com/jankoboehm/Sources into jankoboehm-spielwiese

Conflicts solved:
	Singular/ipshell.cc
	libpolys/polys/ext_fields/transext.cc
	libpolys/polys/monomials/ring.h
fix: need to free memory if NULL is returned