Converted iter_fields() and iter_child_nodes() to work with fparser AST
Updated all of fortran.py to work with f2py.fparser AST
Dummy and actual arg names may not be the same
Merge branch 'master' of https://github.com/jameskermode/f90wrap
Revert "Updated all of fortran.py to work with f2py.fparser AST"

This reverts commit 3932c582189bfb335c72bbaf29e0b332a1c2acaa.
Revert "Converted iter_fields() and iter_child_nodes() to work with fparser AST"

This reverts commit f34b487d90079ab6ea01c9a2da3cc0f904349a02.
Minimal changes to get simple example to work

* Default prefix now .f90 not .f95
* sizeof_fortran_t currently hardcoded in f90wrap script
Simple example based on suggestion by Steven Murray
formatting fixes