The error was a memory access of a freed object.  In ME_AddUndoItem I
checked the top of the undo stack to end a coalescing undo transaction,
assuming that this should be either a valid undo item, or NULL, instead
it was already freed.

Constant numbers start at 0, and the loading loop has a for(i; i <
dirtyconsts; i++). This means that the highest dirty constant isn't
loaded correctly. Rather than replacing the < with <=, which would
make it impossible to have no dirty constant, add 1 to the dirty
constant counter.

rpcrt4: Clear the memory of embedded complex types in ComplexUnmarshall when fMustAlloc is TRUE to avoid passing uninitialised memory to the unmarshaller.

Found by Valgrind.

Programs looking for this flag to verify if FF is present. And on which axes.