20191029084926-Android-531-d9a3ee9: Bugfix/total number of pieces (#271)

* Move pages

* Revert "Move pages"

This reverts commit 407088da221070f9c039360b0c2f021af773d83f.

* 🐛 allow users to set the total number of pieces

* 🐛 change default value of anyCategoryErrors