[10.0][MIG] base_report_to_printer (#68)

* Set api.multi for action called as `object` on view

* Merge syleam printers module into base_report_to_printer (#60)

* [IMP] Updated unit tests

* [FIX] Fixed renamed attributes

* [FIX] Remove deleted fields

* [IMP] Add printing.server and printing.job models

* [IMP] Allow to cancel all jobs, enable, and disable printers

* [IMP] Split the cups part of print_document into a new print_file method

* [IMP] Updated cron job to run the action_update_jobs method

* [ADD] Add a migration script to create a printing server from configuration

* [MIG] Migrate base_report_to_printer to v10.0

Removed deprecated methods on printing.printer (replaced by methods on
        printing.server)

* [IMP] Add wkhtmltopdf in travis configuration file

* [FIX] base_report_to_printer: Fix Update Job Cron
* Fix API issue with Update Job Cron
** Forward Port from 9.0

* [FIX] Fixed the res.users view

The string attribute should not be used as a selector, because it is
translatable.

* [FIX] Fixed the print_document method of report

The new API migration was made to @api.multi because of the "cr, uid,
ids" signature, but "ids" was the ids of the records to print here, not
the report's ids.
Also, the new API version of "get_pdf" get directly the ids of the
records to print in the standard module, not a recordset.

* [FIX] UI is now (un)blocked only when using qweb-pdf reports in standard addons

.travis.yml

@@ -10,6 +10,8 @@ python:
 
 addons:
   apt:
+    sources:
+      - pov-wkhtmltopdf
     packages:
       - expect-dev  # provides unbuffer utility
       - python-lxml  # because pip installation is slow
@@ -18,6 +20,11 @@ addons:
       - python-yaml
       - cups
       - libcups2-dev
+      - wkhtmltopdf  # only add if needed and check the before_install section below
+
+before_install:
+  - "export DISPLAY=:99.0"
+  - "sh -e /etc/init.d/xvfb start"
 
 env:
   global: