Add show histogram button in attribute table
Unify button order in dialogs
Use Ajax request to show histogram
Minor changes
Compress CSS file
Add button to add layer and reload layer tree
Add proper error handling
Merge branch 'feature/addbutton' into develop
Replace close button in legend window
Add buttons to open a video tutorial or user manual
Replace text on buttons as tooltip
Minor fix
Improve identify popup window
Support to identify multiple features