Revert back to using temporary files to send in headers. Allow Functions

Revert back to using temporary files to send in headers. Allow Functions

2008-05-24  Johan Dahlin  <jdahlin@async.com.br>

    * giscanner/ast.py:
    * giscanner/girwriter.py:
    * giscanner/giscannermodule.c
    (pygi_source_scanner_append_filename),
    (pygi_source_scanner_parse_file):
    * giscanner/glibtransformer.py:
    * giscanner/sourcescanner.py:
    Revert back to using temporary files to send in headers.
    Allow Functions to be passed in as callbacks, add a couple
    of try/excepts missing features.
    We can now scan pango

svn path=/trunk/; revision=274