[app-office/mytetra-9999] New package.

MyTetra is open source and cross platform personal manager for information accumulation. It is powerful program for data memorization and structuring notes.

Features:
Infinite ramify tree for notes group
Arbitrary sorted notes at his branch
Arbitrary sorted branches at parent branch
Copy/Paste for notes and branches
Clickable tags
Customizable trash for recovery lost data
WYSIWYG editor
etc.