Add tabs to multiple maps

[liberodark]

Hi,

Tabs is good idea for open more than 1 mmap file and work on two or more mindmap.

Cordialy

[liberodark]

Is my last issue for this day have send too much issues today LOL :D

[Cedoor]

Good issue.
The mmp library has recently been updated to support multi-instance. So, it should not be complicated.

Thanks!