PRD-4585:  Allow dnd capability for group headers and footers. Created new classifications for RELATIONAL_HEADER and RELATIONAL_FOOTER.
Merge pull request #129 from pentaho-skarmali/PRD-4585_unable_to_drop_subreport_in_group_header_band_squash

PRD-4585:  Allow dnd capability for group headers and footers. Created n...