Merge branch 'graph'

Conflicts:
bug_graph_bystatus.php
core/authentication_api.php
core/classes/MantisEnum.class.php
core/file_api.php
core/filter_api.php
core/graphviz_api.php
core/html_api.php
core/print_api.php
core/relationship_api.php
core/string_api.php
core/utility_api.php
manage_proj_edit_page.php
set_project.php