Release v1.2.2

Fix histogram drawing issues.

Changed the method used to determine if Gaussian statistics are used.
Now uses Gaussian if less than 5% of nonzero values are below 5 counts.
This is roughly equivalent to a mean background of 10, but more resilient to high particle counts, and more resilient to random 0s than the previous method.

Improved the look and usability of the Ionic Response Calculator.

Full Changelog: v1.2.1...v1.2.2