* Add MemMapFileStream
* Added tests
* Fixed bug in memfiles (zero index for string)
* Added flush to changelog
* Attempt to fix Win's nuances
* Fix attempt to fix
* Continue...
* And again...
* Reworked tests (all for win on Win)
* Fixes in flush (Win)
* Replace fn vars to consts
* Added the attempts parameter to the flush
* Replace while to for
* Move to memfiles
* Use Natural instead of uint
* Better error messages for append mode. Handle specific cases.
* Fix 2 problems. First, 0 is a valid fd on Unix (easily gotten if user first
closes all fds and then starts using memfiles). Use -1 instead for an invalid
fd. Second, it is best practice to conserve open fds on Unix and file handles
on Windows. These handles are not needed unless the user wants to remap the
memory with ``mapMem`` (or a hypothetical future ``proc resize``). Adding a
new bool param ``allowRemap=false`` to ``memfiles.open`` solves this cleanly
in a "mostly" backward compatible way. This is only "mostly" because the
default ``false`` case does not keep unneeded resources allocated, but that
most sensible default means that any ``mapMem`` callers need to fix all their
open calls to have allowRemap=true, as this PR also does for tmemfiles2.nim.
* Include backwards compatibility note.
