Add Sqlite tree import for SD studio files
Prepare sqlite import to import multiple trees
refactoring in treeimportzeug and add ChangesStrategy stub
work on Change format import sqlite strategy
refactor ChangesStrategy in treeimportzeug
add attributes to ChangesStrategy in treeimportzeug
implement copying of Trees
Refactor signalzeug
added node accessor to LinearizedTree
Merge with master, remove obsolete methods from LinearizedTree, add stub files for ScopedConnection
Implement ScopedConnection, remove signal from LinearizedTree
Modify LinearizedTree
fix ChangesStrategy
Fix segfault

in Signal temporary parameters were captured in a lambda
add name attribute to tree and tree import
Add path methods to Tree
Add non-functioning optimized linearization algorithm to LinearizedTree
fix optimized serialization strategy
Fix includes in treezeug and treeimportzeug
Separated Node and Tree and add  a restrict to subtree method