[PD] Abstractions x Externals

[Bernardo Barros]

Just some ideas...

- Not that this is particularly important, but the word "class" will
not intensify the BIG confusion of considering PureData as a
object-oriented language even further?

- I understand the word 'external' as external to PD, but PD isn't
itself written in C/C++? Aren't they 'extensions' ? Externals,
following that logic, are the ones written in Lua, Python, Ruby,
Haskell etc.

- Abstraction makes a lot of sense, since they really are abstractions
written in PD, even if from the point of the user they can look like a
built-in 'object'.