Add reg option max_cache_size_mb (negative for auto, which would be 1/4 physical memory size but never exceed 512M in 32-bit build. NOTE: LARGEADDRESSAWAREness of host exe is detected MEMORYSTATUSEX.ullTotalVirtual)
BugFix: crash due to errors in xy_widen_region
Add & fix some comments
Support floating point border strength.
Remvoe old PAR relative code. This fixes an assertion failure on Debug build.
Fixed size style support(not finished)