Few fixes

Merged Sandro Christian Wenzel requested to merge swenzel/jalien-root:swenzel/leakfix into master

Fixing a few TMap ownership properties which were overlooked with the memory-leak restructuring.

Fixing pointer release logic in Ls() command.

Convert a pointer to an object.

This commit is fixing an segfault that happened when calling the TJAlien::Mkdir command in a ROOT macro.

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