Disable edit and continue in zlib.

Fixes #1678.
Don't just say 0 for remainFrame in sceAtrac.

Fixes LittleBigPlanet.
Use a base time throughout rtc and kernel time.

This way, time doesn't move abnormally as far as the game can tell,
even when savestates and fast forward and pause are used.
Merge pull request #1683 from unknownbrackets/atrac-fix

Don't just say 0 for remainFrame in sceAtrac
Merge pull request #1685 from unknownbrackets/rtc-fix

Use a base time throughout rtc and kernel time
Merge branch 'master' of https://github.com/hrydgard/ppsspp
Pre-compute all weights and sums for bicubic scaling