[FEATURE] Identify highlight options.
- optional highlight color, line/outline buffer and minimum width
- fixed symbol sizes (thanks to Martin Dobias)
Rewrite the mssql driver to take care of the multithreded rendering
New method to duplicate a vector layer in memory and optionally add it to the map registry
make menthod and variable naming consistent, some cleanup
Fix support for setCacheImage() to enforce refresh of a layer
Reintroduce $map and optional canvas refresh debug logs
highlight fixes
Add README.rst for labeling unit tests
Merge remote-tracking branch 'tamas/master'
[MSSQL] Close database and delete query on close