Page navigation bar should show e.g. 1/20 instead of 0/20

[mangtronix]

From bookreader-devel list:
For pages without an actual page number (eg cover page, frontispiece, contents) I can see there's a page number format generated when getPageNum(...) returns a string beginning with "n".

The display of this (in the "slider") is of the format "x / y" where y is the number of pages, and x is the index. However x is zero-indexed, so this displays page numbers from zero to one less than the total number of pages.

Would it make more sense to change this formatting so that x is 1-indexed?

for example, instead of:
0 / 20 to 19 / 20

show this:
1 / 20 to 20 / 20