Release notes: SpyFu v4.16

** Bugs fixed
* [SF-19196] – Account – Add notification for cc decline subscriptions
* [SF-19226] – MySpyFu – Browser “back” button now navigates within MySpyFu
* [SF-19268] – Recon – PPC Wizard is unable to handle large keyword lists in step 2
* [SF-19292] – SEO Keywords – PDF exports are including an extra rank change column

** Task
* [SF-19232] – Add new FAQ copy
** Improvement
* [SF-19211] – SEO/PPC Keywords – Round the search volume numbers to nearest whole number