* fixed duplicities when working with multiple lines

* fixed last commit

* removed threading which was problematic
* added support for manual annotation
* printing now in constrained layout

* not nice, but working.

* Parameters shifts based on the selected range

* scan headers now partly supported so they can be debugged in future.

* zce fixed
* reformulated time subselection routine - improved readability

* odd/even fixed
* arrow moving fixed
* times argument now purged when loading new file
* fix colors during odd/even times sub-selection
* drl and zce still broken
* exporting/clipping/printing functions probably broken too

* annotation, plotting of parts of chromatogram and zooming seems to work
* odd/even is partially broken
* arrow moving of chromatogram sector seems broken
* drl definitely broken hard
* zce probably broken
* almost not tested

* added functionality to settings
* minor debug of annotation function

* cleaned-up signalization in __main__ (reallocated some calls from
  matplotlib directly to Qt)
* separated image painting for printing and copying to separate file

* zcetools now support negative ions
* fixed glitches in annotation

* rewritten populate and plot_subtime functions in graphtools
* rewritten autozoomy function
* slightly modified the update_spectrum function in __main__
* rewritted the peak picking function
* removed debug prints from the last commit

* changed layout of the QSettings
* added functions for intensity annotation and some memory of user
  preferences

* lines less thick to improve visibility
* added dirview under treeview for quick sweeps

* Fixed if statement in autozoomy
* Masses prediction now calibrated to the main mass

* Now prasopes can predict isotope pattern and plot it into parent
spectrum
* autozoom Y axis action double click in absence of the spectrum now
does not cause exception

* New dock of treefolderview
* fixed bug in drltools window closing

* in DRL table QComboBox should not be always selected (will need to
verify)
* autozoomy now auto-zooms when mass span selection is performed

created function for construction of the tables.

already working layout but pretty dirty coding behind..
clickbuttons not operational

maybe some bugs has been introduced in process