Multi-Select ("sugar" code).

The patch is to be applied in mainline-repo, master-branch.

The workflow is as per
http://wiki.sugarlabs.org/go/Features/Multi_selection_screenshots

The only known "issues" are ::

a)
Journal-View is not updated, when screenshot(s) is(are) taken in
"Multi-Select" mode.
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The reason is that journal-refresh is inhibited in "Multi-Select" mode.

Thankfully, this is not too great an inconsistency, as the users are
need to be educated of the
"Alt + 1 screenshot" feature anyway, when the screenshot is taken in any
other view other than the
Journal-View. That time, the users "need" to know where they may find
the newly taken screenshot(s).

b)
Renaming of entries, does not happen in "Multi-Select" mode.
=============================================================

The issue is mainly in locations other than the "Journal"
(Documents/Pen-Drives), as renaming the entry needs
a corresponding change on the file-system. Due to the fact the refresh
is inhibited in "Multi-Select" mode,
this is not possible.

Thus, with the aim of maintaining UI-consistency,
renaming-in-Multi-Select mode is disabled for "Journal" too.