changes to run source code

Bugfix changes:
* when initializing a new Document from an old one, laod the text of the
old document so that it can be copied to the new (fixes "cannot extract
features" error null/size 0)
* Add tmp.xml to top level directory (JStylo-Anonymouth) -- not sure if
it will commit in Git

Other changes:
* removed line break at beginning in aa_01_t.txt
* added example_feature_set.xml and sample_problem_set.xml; if you run
CumulativeFeatureDriver.main it wants these files but they don't exist