Migration QuickUMLS 1.3 to 1.4

When opening a QuickUMLS 1.3 installation with QuickUMLS 1.4, you'll see the following message:

>>> import quickumls
>>> matcher = quickumls.QuickUMLS('path/to/1.3/install')

[WARNING] This installation was created with QuickUMLS v.1.3 or earlier, which does not support multiple database backends. For now, I'll assume that leveldb was used as default, implicit assumption will change in future versions of QuickUMLS. More info here:

This message indicates that