Remove bitstring.h, we have a newer one in /usr/include

no binary change
ok pedro@
Remove excessive bitstring.h includes.

no binary change (except in log.o, because of __LINE__ usage)
ok pedro@
Update LAYOUT and README to reflect reality.

ok pedro@
Remove header files for components that have been removed

no binary change
ok pedro@
vi doesn't include a copy of db.h and regex.h anymore.

ok pedro@