2to3 some files, manual port others

build/__init__.py
build/builder.py
dictionary/__init__.py
dictionary/entry.py
dictionary/format.py
dictionary/install.py
dictionary/search.py
- Port using 2to3; some instances of list() added that could be removed
  later for improved efficiency.

dbconnector.py
reading/converter.py
- Manual Python3 porting without 2to3.