Added a line tag so as the first step to being able to modify a line. The
line tag is currently only added to the long lines (not tags or empty
lines). As of now there are only contexts for addresses and section names
- right click one of them and it will print the line that was right
  clicked and if you select a menu option, it will print which was
  selected and on what text.
Got basic searching working within the data model. For an example, right
click on any address within the executable section and it will print the
index of that object within the data model. Also added comparators for
mnemonics, op_str, and comment, but haven't yet built the regexes for
those. Should be trivial to apply this technique across the board and we
are getting closer to being able to modify the data structure.
Update README.md

Updated README.md
Made pe.py conform to recent changes to make it not broken
Merge branch 'testing'. Reworked data model and merged into current
master branch.

Conflicts:
	disassembler/formats/common/program.py
	disassembler/formats/common/section.py
	disassembler/formats/helpers/models.py
	interface/contextmanagers.py
	interface/guielements.py
	interface/maininterface.py
	settings/PyDA.conf