iop/soften: Drop locals range and hr, and fixup comment

hr is always equal to radius, and range is only used to calculate hr.
iop/soften: Use SSE for inner blur loop
iop/soften: Apply OpenMP to inner blur loops
src/iop/soften: Use SSE in final output stage
updated pt_PT translation
iop/soften: Use _mm intrinsics instead of operator overloading for compatibility
Italian translation updated
views: Update dt_view_get_image_to_act_on for zoom==1 & full_preview.

Now when zoom == 1 or when full_preview mode is activated, the image to
act on is the only one visible on screen.

This commit adds a lib_only_one_image_seen_id global variable that take
the visible image id when there is only one image visible.
lighttable: Update images_in_row variable.

The lib->images_in_row was only updated when scrolling with a modifier
key activated (always set to 0 in other case). It is needed by the
get_images_in_row function to export this value outside of the lighttable.c
file.

This commit updates lib->images_in_row on filemanager expose and
zoomable table expose.
control/jobs: Update image enumerator to use dt_view_get_image_to_act_on

Now the libs that are using image enumerator use
dt_view_get_image_to_act_on function to get the right image to act on.
Merge pull request #267 from bartokk/master

Italian translation updated
Remove strange file that came with the Italian .po
Add const modifier to the view() routine.
Add a way to expose all image statuses.

No default shortcut defined for this action.
Merge branch 'expose-status'

* expose-status:
  Add a way to expose all image statuses.
  Add const modifier to the view() routine.
Revert "views: Update dt_view_get_image_to_act_on for zoom==1 & full_preview."

This reverts commit ebcc7c27edb72c190b3392e254395c9d452f877c.

This commit changed the size of the settings struct stored in db so we
drop it when loading an old db.
TODO:
- fix this commit (lemagoup is already working on it)
- stop writing this stuff to db
Fix compilation on some system.
[l10n] Swedish update: lowcasing spree translated
Italian translation updated for the new option 'expose-status'
Strings: Acronyms capitalized.