Adding support of data on the Galois structure of units (modulo torsion).
Unit group integral representations changes, and listing of indecomposable
representations for a given group.
When displaying the defining polynomial on a number field home page,
make sure the whole thing is in math mode.
Changed utility function for displaying polynomials which allows
line breaks at +/- signs so that +/- signs are still in math mode.
Center data cells in Frobenius cycle types for a number field.
Merge pull request #194 from jwj61/master

Integral representation support