- Compress images using pngquant
- Added http.send_file() helper
- Move javascripts in the bottom of the page (better google pagespeed ranking)
- Added website.get_image_url() helper that uses a hash allowing the usage of
  a more aggressive cache
- Misc. tools/image improvements

Added an opt-out option available from the button's dropdown

Refactored and fixed tools.image_resize_image() that converted to RGBA
after making thumbnails, resulting in bad looking picture in case the
source is in 'P' mode (indexed palette)

Fixes issue #1755 partially, when the new term
will be translated

As the whitespace is stripped when exporting terms
to translate, it must be done as well when matching
translations at runtime.

Fixes issue #1755 partly

The changes for QWeb template translation have introduced
res_id values in PO comments for all `#: view:` terms, as
the real database id needs to be resolved when loading them.

For non-QWeb views this is not necessary and actually caused
the terms to be dropped when the res_id could not be resolved.

Rather than having a different PO comment format for QWeb and
non-QWeb views, we can extend the QWeb hack to force the
res_id to 0 for non-QWeb views.

Fixes issue #1755

Distributing our version of pyPdf is not required anymore since we
introduced the new reporting tool.

In order to keep reports working, the standard python library
`python-pypdf` has to be installed instead (through pip or your
distribution's package manager)

[FIX] account: account_invoice's onchange_partner_id uses the first partner bank account if several are defined. Merge of #2280

Recently, the graph view was changed to prevent changing groupbys
for active custom filters.  Unfortunately, I did not take into account
the fact that pivot table can be drawn in part when expanding rows.

The "frozen" parameter was then undefined and caused display problems,
this patch should fix the issue.

The method was expecting that name_get() returns complete and in-order values.
Because of this, some records in the recordset could end up without a value.

[FIX] website_hr_recruitment: add param to force all countries else it use GeoIP, check that country returned by GeoIP have jobs availables else fallback on all countries