* Now it accepts also files with 0 correction factors in daughter table.

* purging graph completely before populating, otherwise matplotlib has autoscale issues

* saving of the DRL table and exporting datasets now originates in a logical location
* fixed timeshift misplacement in the exported table
* when adding line the peakwidth is copied from the line above

* better algorithm to detect incompatible files when loading DRL table
* fixed bug which caused crashes when increasing columncount
* reduced workload when descreasing columncount

* changed the ion selection from start m/z-end m/z to m/z-peak width.

* loading of the incompatible file will not crush whole program
* moved to GridSpec layout - constrained layout preparation

* amount of "correct to" columns can be changed now in a software itself
* fix for deletion of multiple rows - now the SW survives
* time shift is now noted in the exported file (has been done in
previous commit, forget to note it)

* columns for "correct to" selection are now responsive as they should

* daughter ion table is more responsive
* we are not dividing by zero anymore (at least I hope)

* input checking when loading DRL configfile improved

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

* Loading multicorrections

* multiple corrections pt1
* steady state aproximation
* time shift

* modified drl dataset layout to dict
* added time shift - modifies also the exported data

* remove_rows written nicer
* copy/paste initial commit, still rough but working somehow..

* fixed load_drl to accept unsetted QComboBox
* simplified update_profile function