Allow data view specification in URL
Allow data view specification in URL

This commit adds support for URLs like "<catmaid-url>/?dataview=<id>"
where <id> is the primary key for a data view. For now, this works for
all data view types except legacay views. This refers to issue #542.

fzadow/CATMAID,htem/CATMAID,htem/CATMAID,fzadow/CATMAID,fzadow/CATMAID,htem/CATMAID,fzadow/CATMAID,htem/CATMAID