[Pharo-dev] [update 2.0] #20607

[Marcus Denker]

20607
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10938 backport 2.0 : an MCOrganizationDefinition should only remove empty 
categories during unload
        https://pharo.fogbugz.com/f/cases/10938
        
10909 Backport Pharo2.0: Prepare isHeadless for new VMs with double dash -- 
arguments
        https://pharo.fogbugz.com/f/cases/10909


Diff information:
http://ss3.gemstone.com/ss/Pharo20/System-Support-MarcusDenker.803.diff
http://ss3.gemstone.com/ss/Pharo20/Monticello-MarcusDenker.779.diff