Add format_timedelta at the report

It would be good to have a converter for showing the timedelta in reports

added trytond type::feature + 1 deleted label

assigned to @xcodinas

review42151002 updated at https://codereview.tryton.org/42151002/#ps1

added 1 deleted label and removed 1 deleted label

review42151002 updated at https://codereview.tryton.org/42151002/#ps20001

review42151002 updated at https://codereview.tryton.org/42151002/#ps263611002

review42151002 updated at https://codereview.tryton.org/42151002/#ps285291003

New changeset d2328dec9188 by Xavier Codinas in branch 'default':
Add format_timedelta in report
https://hg.tryton.org/trytond/rev/d2328dec9188

added 1 deleted label and removed 1 deleted label

closed

New changeset c5b73f53b438 by Xavier Codinas in branch 'default':
Add format_timedelta in report
https://hg.tryton.org/tryton-env/rev/c5b73f53b438

I came late but I have few remarks on this. I put them in the codereview.

added 1 deleted label and removed 1 deleted label

reopened

Here is review257891002 that fix my late comments.

assigned to @ced and unassigned @xcodinas

added 1 deleted label and removed 1 deleted label

review257891002 updated at https://codereview.tryton.org/257891002/#ps265791002

New changeset ca0465b43a33 by Cédric Krier in branch 'default':
Improve Report.format_timedelta
https://hg.tryton.org/trytond/rev/ca0465b43a33

closed

added 1 deleted label and removed 1 deleted label

New changeset f329a9c83d52 by Cédric Krier in branch 'default':
Improve Report.format_timedelta
https://hg.tryton.org/tryton-env/rev/f329a9c83d52