Portability status:
- FreeBSD: Disable SMPI mmap privatization, switch automatically to dlopen.
- Mac, BSD: dlopen+thread broken, switch automatically to raw contexts.
+ - Java JAR file should be finally fully working on Mac OSX too.
XML platforms: Switch to platform v4.1 format.
* This is (mainly) a backward compatible change: v4 are valid v4.1 files