Merge pull request #66 from sogis/aproach

added spatial printing-information
Fixed postgres provider identification
Merge pull request #67 from sogis/aproach

bits and pieces
Merge pull request #68 from elpaso/master

Fixed postgres provider identification
free theme-switcher whaldow
post2get
added optional 'thumbnail' parameter to theme switcher config
added optional layerImageFormats config to GlobalOptions to override the image format for some layers;
fullColorLayers is merged into layerImageFormats on init
fix layer tree init if visibleLayers is empty
Merge remote branch 'upstream/master' into aproach
added printpostget