Expressing images in contrast/arcsec^2 or Jansky/arcsec^2, restructured code and configuration file

• Added analysis of master flux frames to enable the user to express the final images in contrast/arcsec^2 or Jansky/arcsec^2
• Restructered code and configuration file to allow for the separate execution of pre-processing, polarimetric differential imaging (previously referred to as post-processing) and angular differential imaging
• Added plot of center coordinates of center frames vs time
• Added possibility to open documentation through terminal command "irdap --website"
• Confirmed that polarimetric data with dithering applied is correctly reduced