Misc cleanups.


git-svn-id: https://fricas.svn.sourceforge.net/svnroot/fricas/trunk@1727 b0c55286-4f34-0410-a049-a1e7e93b0762
Add helpers for traversing OutputForm.


git-svn-id: https://fricas.svn.sourceforge.net/svnroot/fricas/trunk@1728 b0c55286-4f34-0410-a049-a1e7e93b0762
Clean up fortran output.


git-svn-id: https://fricas.svn.sourceforge.net/svnroot/fricas/trunk@1729 b0c55286-4f34-0410-a049-a1e7e93b0762
Avoid creating strange unions in 'resolve'.


git-svn-id: https://fricas.svn.sourceforge.net/svnroot/fricas/trunk@1730 b0c55286-4f34-0410-a049-a1e7e93b0762
add syscmd ioHooks
ioHook for error function
compile user guide into book.tex
generate most .ps files from corresponding .VIEW