Remove html tags from License text

Bug 3400
Add qualifier to DrugBank feature and plugin versions
Add qualifier to all features and plugins
Fix DrugBank feature License text
Add .DS_Store to gitignore
Move Sample Data files from bioclipse.core.data

and fix some small issues
Fix typo in 3D structures description - Bug 3454 fixed
Update version to 2.6.0.qualifier
Updated versions for 2.6.0

solves bug 3458
Updated versions for 2.6 release
Release 2.6.0

Merge from branch '2.5.x'