internal void UpdateBranch(Branch aBranch, string aId)
{
string path = Path.Combine(iFolderHeads.FullName, aBranch.Name);
FileInfo info = new FileInfo(path);
var file = info.Create();
using (var writer = new StreamWriter(file))
{
writer.Write(aId + "\n");
}
aBranch.Update(new BranchFile(this, info));
}