removed warning that is now incorrerect: new temporary heaps can be mapped with STORE_MMAP (onto a large temporary file) and be writable.
removed warning that is now incorrerect: new temporary heaps can be mapped
with STORE_MMAP (onto a large temporary file) and be writable.

also removed comments in move heap, justr for clarity..

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb