Scipion-em-cistem

- fixes for tomo ctffind protocol
- remove unnecessary scipion 2 code
- remove writeShiftsMovieAlignment
- use "with open", default phaseShift=0
- refactor ctffit plot code

- First Scipion 3 / python 3 version.
- Added continue mode to refine2d
- Fixed picking test
- CTFFind fit plot updated to match official doc
- Added viewer for unblur
- Added import particles from Frealign to keep compatibility
- Added ctffind4 protocol for tilt series