Integrate support for multiple simultaneous WMS layers into msui client
Issue #3
new
Currently the msui can only display one WMS image at a time. Similar to other WMS clients, an overlay of multiple (transparent) maps should be possible.
This could be realized by implementing:
- support for multiple WMSControlWidgets
- these WMSControlWidgets should (optionally) synchronise level, init time, valid time with a "master" control
- multiple images may need to be combined into one image for display with matplotlib -- maybe this has changed, otherwise PIL (Python Imaging Library) should provide functions
We already have code for this, needs to be reviewed and merged.