bugfix: web/BIEN3/Redmine/issues/.htaccess: need to store dest in separate var because % is treated specially in the replacement str

web/BIEN3/Redmine/issues/.htaccess: main page: sort by priority

web/BIEN3/Redmine/issues/.htaccess: perform .. redirects using new ! prefix

web/BIEN3/Redmine/issues/.htaccess: main issues page: added default filter conditions

bugfix: web/BIEN3/Redmine/issues/.htaccess: need to redirect to separate URL for individual issues, because they are not located under the issues/ subdir in Redmine

added web/.issues symlink and dest dir (needed because Apache does not support dangling symlinks)