[PDCurses] Re: Alternate Character Set of VT100

[anatoly techtonik]

To make it more clear, I am trying to decouple the logic in port
implementation from C semantics to understand how PDCurses work, and so far
the mapping of ACS_ macros and its purpose is not very clear. The guide say
what should be done in ports, but it is still not clear why it is needed
and what should happen between PDCurses and Operating System.