vcl: move the Impl class of MapMode ...uhm... out of the public header?

And remove the tools/fract.hxx include.

grep -l -r fract.hxx workdir/Dep/*Object* |wc -l
before: 4569
after:  1851

Shrinks some libraries, example from --enable-dbgutil Fedora gcc 4.8.3:
libvcllo.so by 473k (0.35%)
libswlo.so by ~1Mb (sadly that is just 0.2%)

Change-Id: I09bd025d551a5d2c5528b938a68c6aa5f8f114a0
vcl: remove more unnecessary headers from mapmod.hxx

Change-Id: I9ce4c11cc9e7e703fbaad76a062ad38bb900ed9a