Tested for equal outcome to V2.1.0

Tested (with ...bugfix = false) to generate equal results as previous version.

Variable names are now more consistent and clear.
No functional changes.

In the sumspectrum calculation, the mz range was determined incorrect. This has been fixed (in if BUGFIX_SUMSPECTRUM for now)

Renamed variables for readability.
Removed unused code.
Added comment for problematic code
Tested that output is still the same with reference data set.

Comment added and improved variable names for readability.
Output is not changed on test against reference data .

Avoid opening the same dialog multiple times, show the "current" one on top.

Output with new sumSpectrum differs from previous versions.

Added changes from Bas

The default value for EXTRACTION_PADDING is now 0.
Also, the setting is correctly loaded from the Settings.txt file.
Requested by David Falck, 20230302

As requested by David in the Github version of Lacytools on December 2, 2020

This build adds some simple checks on the reference list and will inform
the user if a building block was listed that is unknown to LaCyTools or
if the user forgot to specify the amount of times that LaCyTools should
use the specified building block.

Create CODE_OF_CONDUCT.md

Updated wording to reflect Python3 upgrades and imminent refactoring

Python3 intermediate

This build offers the first Python3 compliant (non refactored) version of LaCyTools.

This build is the beginning of a quick and dirty Python3 port of
LaCyTools v1.1.0.

This build fixes an issue that arose in the restructured `createHeader` function and could cause LaCyTools to stop while writing the final summary (when it encountered an analyte for which it did not know a mass).

This build implements a setting (can only be edited in the source code) that tells LaCyTools if it is allowed to create a new analytes.ref file or if it should use the existing analytes.ref file (line 53).

NOTE; This does not check if there actually is an analytes.ref file present in the folder, this is the user's responsability.

This build implements an option to evaluate peaks before the mono-isotopic peak, by using the `Extraction window padding` option.

This build removes a residual print statement from testing the previous
build.