pmc2c-multi-nativepccmethod branch ready for testing

[Peter Lobsinger]

The pmc2c-multi-nativepccmethod branch changes the implementation of
MULTIs in .pmc files from NCI to NativePCCMethod. This means that
these now handle their own PCC, in stead of rellying on NCI thunks to
accomplish this. These can now be modified to access a more broad
range of PCC functionality. On the NCI side of things, this
unentangles NCI from Pmc2c, allowing for changes to proceed.

At the current time, the branch passes all tests in core and I am
testing HLLs. Please test this with whatever you see fit.