VMM,DevVGA: Don't resolve RC symbols when HM is enabled (part 1).
PGMPool: Eliminated fictive page (except NIL). #6367
header (C) fixes
VMM: HM cleanup.
Doxygen.
Doxygen, comment typos.
PGMPool: Adding A20 state to the page pool (partly disabled).
nits.
VMM: -Wunused-parameter
VMM,INTNET: Addressing unused variable warnings.
VMM source reorg.