Update readerfooter.lua

Add "pages left to next chapter" to minibar
Update readertoc.lua

Add "pages left to next chapter" to minibar
Update defaults.lua
Update readerfooter.lua
Update readerfooter.lua
Update readertoc.lua
removed "next chapter" for PDFs

Should actually also be done for EPUBs without TOC, but somehow I can't get it to work
set DMINIBAR_ALL_AT_ONCE = false
Merge pull request #684 from WS64/ws64

Configurable "mini" progress bar