New Scala & Windows

Next version of xia2 will probably have an updated version of scala included - 3.2.34. This is much improved in a number of ways which are not clear to me but I believe. However, this seems to require that on windows the CCP4_OPEN environment variable is in UPPERCASE as UNKNOWN not lower case as unknown. So if you find some strange errors with files this is probably the problem. The setup script should overwrite this though...