add resolve_modify_field and resolve_modify_field_g function. Rename SERVICE_STRUCT and TREE_STRUCT to DATA_SERVICE and DATA_TREE respectively

rename field deps to depends and ndeps to ndepends, add requiredby and nrequiredby field. Change interface of service_resolve_sort_bytype. Add service_resolve_create_master function

add tree_resolve_create_master, tree_resolve_modify_field, tree_resolve_field_tosa, tree_iscurrent, tree_isinitialized, tree_isenabled and tree_ongroups function

interface changes: allow to display the resolve file for a service or for a tree, add -v option. Pass through new resolve format.

add fields: Groups, depends, requiredby. Pass through new graph function to compute the dependencies. Use new function tree_iscurrent, tree_isenabled