query custom_fields and output them for planning_elements and projects
inserted copyright notice into custom_fields files
output extra fields for WorkPackageCustomField
call work_package planning_element
write custom fields for work packages through API v2
Note: the planning_element_params key order is important (ugh ...)!
'type_id' has to appear before 'custom_fields' for it to work.
test planning element custom field create/update
don't keep standard type around
test custom_field rendering
render custom_fields views using rabl
render custom field values with rabl too; but not in projects!
transitional custom field rendering in projcets/show and planning_element/show;
to be changed once switch to rabl is complete
necessary permissions for custom_fields via XML
eagerly load custom_fields; require :edit_project permission to view /custom_fields
list projects' planning element custom fields
fixed changelog

added changelog entry
eager load all the things in projects/planning_element_custom_fields
list custom fields grouped by type
eager load custom_values in projects/index