Extend bibliography.
Revise last section.
Mention Oliveira.
Update papers on object algebras.
refined intro
fixed examples
more work on intro
some more references
more related work
more related work
first semi-complete draft of intro
bib typo fix
more bib fixes
Attempt to systematically refine the signature of Inh
Sketched subsection on l-attributed grammars

A new motivating example (indexing of in order traversal) is introduced
and the encoding of inherited attributes as pre-function-algebras is
presented as solution.
added a sentence about parsing
first version of related work
Normalize some references.
Explained extensions and added a reference each
Normalize references.