tooltip_link enable for custom data.

[prasantpoudel]

i have make the html file from .graphml file. when i hover over the node there is nothing present like description and node type.
I went to the source code i found that if we are making the graph and manually adding the node, edge and label as href link then internally this will enable and code will be written in the Html file.

In my data i don't have href link to enable this automatically, i have to paste custom popup code every time when i generate a graph. need this support.

from line 147-166 and 467-529.

path pyvis/pyvis/network.py
line: 440 generate_html function

path: pyvis/pyvis/templates/templates.html