Move render_mode support out of unireader.lua into djvureader.lua as it is djvu-specific. Also added support for all other rendering modes handled by djvulibre. Also made the message print a human-readable description of the mode rather than just the number.
Move render_mode support out of unireader.lua into djvureader.lua as it is djvu-specific.
Also added support for all other rendering modes handled by djvulibre.
Also made the message print a human-readable description of the mode rather than just the number.

Conflicts:

	djvureader.lua
	unireader.lua

chrox/koreader,ashhher3/koreader,frankyifei/koreader-base,NiLuJe/koreader,Frenzie/koreader,Hzj-jie/koreader,Markismus/koreader,noname007/koreader,apletnev/koreader-base,Hzj-jie/koreader-base,robert00s/koreader,apletnev/koreader-base,apletnev/koreader-base,NiLuJe/koreader,Frenzie/koreader-base,frankyifei/koreader,apletnev/koreader,frankyifei/koreader-base,NiLuJe/koreader-base,Frenzie/koreader-base,chihyang/koreader,frankyifei/koreader-base,Frenzie/koreader-base,koreader/koreader-base,houqp/koreader,houqp/koreader-base,NiLuJe/koreader-base,lgeek/koreader,houqp/koreader-base,koreader/koreader-base,koreader/koreader-base,Frenzie/koreader-base,NiLuJe/koreader-base,pazos/koreader,Hzj-jie/koreader-base,Frenzie/koreader,Hzj-jie/koreader-base,koreader/koreader,NiLuJe/koreader-base,poire-z/koreader,koreader/koreader-base,houqp/koreader-base,mwoz123/koreader,poire-z/koreader,frankyifei/koreader-base,koreader/koreader,NickSavage/koreader,mihailim/koreader,houqp/koreader-base,ashang/koreader,apletnev/koreader-base,Hzj-jie/koreader-base