[drawgantt-svg] fix hierarchy display in the case it uses cpuset

If cpuset is used as a resource properties in the hierarchy, draw a
rectangle for every cpuset, even if the next one has the same value.
Unlike resource properties, cpuset are not unique per se, but loops for
every new network address. Also cpuset are likely to be at the finest
grain of the hierarchy, so this workaround should be just fine.
[init] fix pid file for node init script
[drawgantt-svg] Fix resources hierarchy display

Last fix actually introduced a bug... This should be correct now.
[drawgantt-svg] code hardening
[drawgant-svg] fix default filter config for pg
[drawgantt-svg] rework nav bar + add permalink + datetime picker

do not use relative date as required by the permalinks.

datetime picker is nor really supported by firefox/chrome/ie, but it
currently works as a text field.
it is said to be supported by safari/opera, but not tested.