This patch augments the XML dumps with a 'directivelist'
subnode which lists all raw preprocessor directives met
while reading the source code in each configuration.
Also, the addons/cppcheckdata.py file has been extended
to give easy access to the list of directives and to
provide Python support for the --template (or short -t)
option.
Finally, an new addon, addons/y2038/y2038.py, is created
to detect when a glibc symbol might be Y2038-sensitive,
based on whether and how _TIME_BITS and _USE_TIME_BITS64
are defined when meeting the symbol.
With multiple configurations, option --dump only dumps
the last configuration.
Fix it to dump every configuration.
Also update all Python addons so that they can handle
multiple-configuration dumps.
Additionally run autopep8 on addons/*.py.
The results of 'make test' before and after applying
this commit are identical.