Fix buffer overflow in spadint.c.


git-svn-id: https://fricas.svn.sourceforge.net/svnroot/fricas/trunk@1714 b0c55286-4f34-0410-a049-a1e7e93b0762
Fix a few HyperDoc examples.


git-svn-id: https://fricas.svn.sourceforge.net/svnroot/fricas/trunk@1715 b0c55286-4f34-0410-a049-a1e7e93b0762