district & region: Unify template for program blocks, finish management command

README.md

district/blocks.py

district/templates/district/blocks/program_block.html

...rict/templates/district/blocks/redmine_program_block.html

redmine_utils/management/commands/update_redmine_issues.py

redmine_utils/models.py

redmine_utils/utils.py

region/blocks.py

region/templates/region/blocks/program_block.html

region/templates/region/blocks/redmine_program_block.html