Replaced NOTSET from typedefs.h by local solutions.
In a continuing effort to get rid of typedefs.h here the
dependence on typedefs.h for the NOTSET variable is removed.
In gmxpreprocess a local files notset.h defines NOTSET as an int
and to make this work all references to typedefs.h were removed
from the header files. Of course this does
not change the crappy logic of assigning a value to an int and
hope that it will not turn out to be a valid number.
Change-Id: Ic598b5a6c9e71106a37d2679aa7522b5ada44247