Re: [INFO] Buffer/PMC unification

[Leopold Toetsch]

Changes #6.

- PMC_*_FLAGs are history.
- I did remove the bogus looking, unused, untested and superfluous <destroy> from core.ops

All access to PMC/Buffer->flags has to be done via the accessor macros in pobj.h. If some are missing, please add them, when needed.

Next will be hiding other Buffer/PMC structure members that might conflict, like buffer and buflen.

leo