update PDF version when setting PDF/A conformance
use OpenPDF 3.0.5.jaspersoft.1-SNAPSHOT
use the stock OpenPDF method to add link struct
use own PDF version instead of the one from OpenPDF
honour -P openpdf3 in samples mvn exec:exec
fix NPE on null PDF structure entry
rename PDF folder to match Maven artifacts
Merge remote-tracking branch 'origin/develop-JRL-2094' into master-openpdf3