Minor documentation and whitespace fixes


git-svn-id: https://fricas.svn.sourceforge.net/svnroot/fricas/trunk@1830 b0c55286-4f34-0410-a049-a1e7e93b0762
Add 'coefficients' and 'series'


git-svn-id: https://fricas.svn.sourceforge.net/svnroot/fricas/trunk@1831 b0c55286-4f34-0410-a049-a1e7e93b0762