Big cleanup

[tdivis]

• Fixed some unresolved imports and undefined variables
• Removed lot of unused imports and variables, removed some re-imports
• PEP8-ify white spaces, removed trailing spaces, blank lines are blank etc.
• Added some false positive error/warning disabling for pylint and pydev
• Did some refactoring to remove code duplication
• Fixed lot of object's attributes were not defined in init
• Refactored some variable names to code be more readable
• Removed some variables redefinitions (either build-ins and few locals)