Set dirty_background_ratio and dirty_ratio to 15 to prevent LAGS!

When we use all the RAM, system LAGS to release big amount of RAM
in one push. to give full range on new CACHE RAM.

Prevent this action by setting reasonable tuning.
Merge remote-tracking branch 'dorimanx/master'
When using data_writeback, we not need to set commit timeout. it's not used.

data_writeback commit on it's own timers.
Added +25mv to CPU Voltage Group 5, to get stable OC.
Updated SuperSu 1.30 from ChainFire!.
Set GPU voltage for 108Mhz to 900mV it's stable.
Tuned RAM system, removed SCHED tuning. + small things
CM-KERNEL not using oom_kill_allocating_task, and after tests, OK!

Better not waste power on cleaning task all the time.

when low ram, they cleaned any way by lowmemkill code.
and now system apps/services protected!
To speed up the system we must set dirty_background_ratio=15
Added two new parameters for nightmare governor!
Removed a space:)
Fixed SWAPPINESS set to 60 on boot, and system try to use SWAP.
Removed all ' character into customconfig!
Removed space between unit=""!
Tuned init dirty write/expire and protected uci.sh + rootbox bug fix.
Fixed Low Mem Kill tuning! here was critical mistake!

Every value that was set here is not the real ram size to be free for each group!

it's value * 4 = real MB limit! as it's set in lowmemorykiller.c

so when i say 2048 it's 2048 * 4 = 8MB RAM limit!

and so on! now all will work as should! and no more OOM dead phone.(SOD)
Tuned also LOWMEMKILL at screen off!
Fixed LOWMEMKILL, Tuning, was too LOW. nothing killed, now OK + MORE

Tuned Overcommit tuning, and set more min free.
Added ZRAM to performance profiles, to support HIGH ram needs!

can be disabled any time.
Merge remote-tracking branch 'dorimanx/master'