Make mapserver install location version independent * src/java/de/intevation/mxd/writer/MapScriptWriter.java, mxd/connections/SDE/sde_areas.txt, contrib/installer/bin/ms_6.1-dev/Readme.txt, contrib/installer/bin/MXD2map-Shell.bat, INSTALL.txt HowTo-Release.txt: Make mapserver install location version independent s/ms-6.1-dev/mapserver/g

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