Support Path Links Starting from Home Folder with ~/

[emendir]

The feature which gives one the ability to link text in a cherrytree node to a file/folder on the local filesystem is great, but it does not yet support paths starting with ~/, for example ~/.bashrc, which means 'the file called .bashrc located in the current user's home folder'.
Instead, CherryTree currently interprets such paths as relative paths, looking for them in the directory of the CherryTree file.

[giuspen]

ok will be in 0.99.52