Adapt to new datascheme

[motey]

With release V29 https://github.com/covidgraph/motherlode/releases/tag/V29 which is deployd to the dev database ( https://db-dev.covidgraph.org ) atm (as 07.06.2021) there are some minor changes in the BIOBASE loader datascheme.

Task to adapt:

• @mpreusse needs to outline the changes
• The app needs to be adapted to these changes
• The app can be tested against the dev db
• The DEV data and the app can be pushed to PRD (when Adapt to new datascheme visual-graph-explorer#51 is resvoled)

[mpreusse]

Here is what changed in the data model:

There used to be the label :GeneSymbol which contained names for genes. This was a legacy model that made it into CovidGraph because we wanted to get started as soon as possible.

There is also the label :Gene which so far contained IDs for genes.

To make the model easier we renamed :GeneSymbol to :Gene and added a proeprty type='symbol' for all nodes that used to be :GeneSymbol.

For queries:

(g:Gene {type: 'symbol'}) == (g:GeneSymbol)

[motey]

@al-v-in @ed-morgan
Do you think there must be made any adaptions on your side?