* fixed issues with constrained_layout/get_tightbox call - used when
printing

* fixed multiple lines issue

* fixed duplicities when working with multiple lines

* fix for commit #53fbd3af

* fixed last commit

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

* not nice, but working.

* QStatusBar is now updated in main thread, not in side-thread

* Parameters shifts based on the selected range

* Experimental parameters support for TSQ, without time subselection
* fixed file loading exception handling

* FileTree now loads in better view
* GUI is not frozen anymore during file loading

* rewritten few lines of code to make it more shorter and clear
* moved toolbar into main widget toolbar position

* side-thread cleaned up when closing, so program does not crash
* input sanitization in drltools floatize function

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

* putted QFileSystemModel into separate thread
* minor glitch fix of DRLtools

* drltools roughly fixed
* not tested!!

* spectrum can be now clipped as table by ctrl+shift+c
* exporting fixed
* drl still broken

* zce fixed
* reformulated time subselection routine - improved readability

* Fix broken __main__ from pt2
* printing/clipping fixed
* for broken things, please refer to pt2

* 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

* fixed TypeError in settings which can be triggered when the settings
  are opened for the first time.

* 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

* zcetools got broken by previous commits to graphtools, fixed it.

* Printing is not perfect, but it is somehow working

* Experimental printing support
* Added script to generate icon python resource

* 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