Added a package hierarchy for different versions.

README.md

parser/parser-cp2k/cp2kparser/parsing/parser.py

parser/parser-cp2k/cp2kparser/parsing/versions/__init__.py

...rser-cp2k/cp2kparser/parsing/versions/cp2k262/__init__.py

...p2k/cp2kparser/parsing/versions/cp2k262/implementation.py

...kparser/parsing/versions/cp2k262/input_xml/cp2k_input.xml

...parsing/versions/cp2k262/input_xml/cp2k_input_tree.pickle

...parser/parsing/versions/cp2k262/input_xml/references.html

.../cp2kparser/parsing/versions/cp2k262/input_xml/units.html

...-cp2k/cp2kparser/parsing/versions/cp2k262/inputparsing.py

...-cp2k/cp2kparser/parsing/versions/cp2k262/outputparser.py

...r/parser-cp2k/cp2kparser/parsing/versions/versionsetup.py

parser/parser-cp2k/cp2kparser/scalainterface.py

parser/parser-cp2k/cp2kparser/utils/baseclasses.py