Fixed a few shadowed variable and unused variable warnings

Change-Id: I84e729c653e0c16c7303d735a5d5b692ecd1535b
Merge topic 'fix_some_warnings' into next

6185dd45 Fixed a few shadowed variable and unused variable warnings
Fix formatting of labels with exponents on Windows

The exponent of numbers formatted with the *printf* family of functions
has 3 digits on Windows but only 2 on all other systems. Fixed
this with Win32-specific code.

Change-Id: I00afd0a5926bc7bf4088faf5e54a5559d27701ca
Merge topic '14696_min_max_labels' into next

2fb777a5 Fix formatting of labels with exponents on Windows
Factorize the different search into one widget

Multiple widgets were implementing their one search and with methods
re-implement in each class. This is obviously difficult to maintain so all
those search were factorize in this widget.
The pqSeachDialog offers 2 main features:
 - If the user presses Esc, the search text is automatically cleared.
 - The advanced button can either: not be displayed, displayed normally
 or displayed and saved/restored as a setting

Consequently replaced the searches in the appropriate widgets by the new
pqSearchBox.

Change-Id: I3e1560634566d6d207c2b1e86877df0b0261d38f
Testing for the pqSearchBox

Add a very basic test for the search box to make sure the basic interaction
are here (Esc key and advanced button clickable).
Fix all the QtTesting test that were influence by the factorization of the
search to pqSearchBox.

Change-Id: Ifc384e8bb3740ee2118585ee119265234c1bec9a
Merge topic '14737-SearchBoxWidget' into next

5db2be4e Testing for the pqSearchBox
026b6dc5 Factorize the different search into one widget
pv*server: load plugins in the data and render servers

Change-Id: I16f98a56b9ad6fca1dc718346d0bdf18ce4b862d
Merge topic 'static-plugins-in-servers' into next

021c4604 pv*server: load plugins in the data and render servers