issue #359 - ASSIGNED: Implement FilterGraph EMF/GMF model 
http://agalaldev.info/dev/mantis/view.php?id=359

- Committing the generated EMF editor, to be a base for customizations
in the future
issue #359 - ASSIGNED: Implement FilterGraph EMF/GMF model 
http://agalaldev.info/dev/mantis/view.php?id=359

- Port instances are added to the filter instance according to the
filter type attribute (needs more EMF research to complete the
implementation, i.e. remove old port instances)
- Installed filters are added to an EMF file "installed_filters.model"
when OVAP starts (file temporarily has a hard-coded location
set to /test/installed_filters.model in project "test" - this needs to
be fixed using linked resource in each project pointing to the
installed filters file located in .metadata folder of the workspace)
- EMF editor loads all ".model" files into its editing domain, such that
all EObjects in all model files are accessible