Upgrade Apache Felix to 4.2.1
Get BundleContext from FrameworkUtil (cleaner)

Conflicts:
	weasis-base/weasis-base-viewer2d/src/main/java/org/weasis/base/viewer2d/internal/Activator.java
	weasis-core/weasis-core-api/src/main/java/org/weasis/core/api/internal/Activator.java
	weasis-core/weasis-core-api/src/main/java/org/weasis/core/api/service/WProperties.java
	weasis-core/weasis-core-ui/src/main/java/org/weasis/core/ui/internal/Activator.java
Fix export JPEG issue
Share tree and model for exporting plugin
Close stream issue. Make some methods public
Get root node from export tree
Data explorer factory
Add toolbar position
Add ToolBar factory
Fix icons in DICOMDIR
Merge branch '1.2.x' of https://weasis.repositoryhosting.com/git/weasis/weasis-dev.git into 1.2.x