Change from session to url graph initializer

[sgratzl]

In the current version when initializing a new session (from start menu, e.g. open a namedset) the configuration will be transported through the local browser session. A more clean solution would be using url parameters instead and evaluate those within the application.

e.g. /human/gene/namedset/all and similar ones. In the local development version a request parameter (?init=...) could be used