Remove unnecessary HTML tags
styling for image result size
Remove front-end validation for group categorical variable and send new flag to backend to indicate wheter group variable is categorical or not.
Code clean up
more code clean up
add new line at end of file
Merge thehyve/master into issues/linegraph_group_categorical_flag
Allow single/no group variable in Line Graph

Fixes UAT-177 and UAT-176 (respectively).
Merge branch 'issues/linegraph_group_categorical_flag'