swig: language independent exception handler
gr: added to the .gitignores to various components for in-tree builds
gruel: using a copy of swig's intrusive_ptr.i to support the PMT wrapping.
gruel: added missing ignores
gruel: fixed swig interface file to dereference pmt_t.
gruel: fixing structure. Passes make check.
gruel: SWIGing Gruel into Python to access PMTs.
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