[Pharo-project] new Cog VMs in http://www.mirandabanda.org/files/Cog/VM/VM.r2540/

new Cog VMs in http://www.mirandabanda.org/files/Cog/VM/VM.r2540/. Cog VM binaries as per VMMaker.oscog-eem.154/r2540. Fix bad conceptual bug with become on methods. Unlike full and incremental GC, the reference from a Cog method to its method object must not be remapped since they're two halves of the same object. Fix FileStreamTest>testPositionPastEndIsAtEnd on unix & Mac OS. Merge Merge VMConstruction-Plugins-OSProcessPlugin-dtl.33's changes. Regenerate the apparently truncated nscogsrc ZipPlugin.c. Handle more libc variations for LD_LIBRARY_PATH in the unix launch scripts. -- best, Eliot