update travis config

use UNIT_TEST=1 so as not to have to worry about installed modules breaking the
tests of other modules
[WIP] test an experimental maintainer-quality-tools branch
experimental branch merged
allow budget overruns on sources

A strict check like that one is too rigid: it turns out that it can be
useful to send cost estimates that are over the limit.
Regroup currency and country in view
Remove button 'View Prices' as not usable
Reorder fields in LRL tree view
ui fix: align budget fields of LR line form
fix: take accounting outside inner groups
Add amount_total in tree view
Add missing total_amount on inner LRL view
set PO origin field to visible

otherwise it is impossible to manually encode it.
Add remark fields for budget older and financial officer
same change for the lrl form inside the lr
Fix test as related currency is not available.
fix a crash

when adding a LR line if no currency is set, you would get a crash otherwise.
keep an env with most modules installed

@pedrobaeza and @dreipt argued this was a good idea
Merge pull request #52 from gurneyalex/8.0-fix_LR_creation_crash

fix a crash
Merge pull request #49 from yvaucher/8.0-logistics-req-ui-imp-2

8.0 Logistics requisition UI Improvements - 2nd run
Merge pull request #47 from lepistone/disable-enforced-budget

allow budget overruns on sources