there are now three startup files; ost_startup.py (former init_cl.py) initializes non-gui ost; dng_startup (former init.py) initializes dng; and gosty_startup initializes gosty (some issues remain what to put into dng_startup as opposed to gosty_startup). also, files are now properly placed into site-packages/ost (on osx and linux)

Without the quotes the scripts don't work if there is a directory
with spaces in the binary path.

1. Option to move libexec to lib/openstructure/libexec
2. Gosty moved to libexec

changed cmake scripts to allow building as subproject / moved common configuration from startup scripts to separate script

git-svn-id: https://dng.biozentrum.unibas.ch/svn/openstructure/trunk@2593 5a81b35b-ba03-0410-adc8-b2c5c5119f08

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