Update __init__ file description.
Remove useless comments.
Add table dumping method
* python_org/orgclass.py: Make link integrated to each line.
* python_org/test/orgclass_test.py: Add corresponding tests.
* python_org/orgclass.py (BasicLine): Add timestamps feature. make it
  initialize as a datetime obj.
  python_org/test/orgclass_test.py (OrgClassTestCase.test_BasicLine_hastimstamp_True)(OrgClassTestCase.test_BasicLine_hastimstamp_False): Add its tests