Especially for the file system filter, it's better not to block while
collecting all the file names by first iterating over the file system.
Now, the filters return an iterator, and the search thread takes a file
from it, searches it, and takes the next file.

This also unifies the file iterator for the custom locator filters and
the find in files on file system search filter.

Task-number: QTCREATORBUG-1690

 * Add a method to get a task from the taskmodel.
 * Use it.

Reviewed-by: dt

 * Add task handler to show VCS blame output.

 * This taskhandler is not yet used!

 * Add task handler that enables copying task data into the clipboard

 * This is not yet used!

 * Add a taskhandler used to show the file/line a task is referring
   to in the editor.

 * This is not yet used!

 * A taskhandler is a class used to implement actions that can
   be done on tasks. This allows for decoupling the taskwindow from
   the functionality it provides, allowing for extensions to provide
   new actions there.

Reviewed-by: dt

that's consistent with qmake, but without practical relevance.

when appending a list with one empty element to an empty list, we'd get
into a state which would subsequently cause an assert.

use lowercasing only as a fallback

function calls need to change _FILE_ - but none of the other
context-indicating variables.

catch up with the recent change in qmake

that's - as usual - making things rather braindead:
- the included files inherit the current context's function defs,
  but not the variables
- default_pre.prf is re-loaded for infile()/$$fromfile()
- the entire config is re-loaded for include(file, PREFIX)

Conflicts:
	src/shared/proparser/profileevaluator.cpp

What about paths that actually contain spaces?

Reviewed-by: Erik Verbruggen

the cumulative mode tries hard to never lose already assigned variable
values. the naive implementation turned assignments into additions,
which made the trivial construct "FOO = $$FOO" double the size of the
array each time it would be executed.
so instead let the assignments be assignments, and then re-add the
values that would be dropped.

Reviewed-by: dt
Task-number: QTCREATORBUG-1595

Conflicts:
	doc/qtcreator.qdoc
	src/plugins/help/helpplugin.cpp
	src/plugins/projectexplorer/projectexplorer.cpp
	src/plugins/projectexplorer/projectexplorer.h
	src/plugins/qt4projectmanager/qt-maemo/maemopackagecontents.cpp
	src/plugins/qt4projectmanager/qt-maemo/maemopackagecontents.h
	src/plugins/qt4projectmanager/qt-maemo/maemopackagecreationstep.cpp
	src/plugins/qt4projectmanager/qt-maemo/maemopackagecreationwidget.cpp
	src/plugins/qt4projectmanager/qt-maemo/maemoruncontrol.cpp
	src/tools/qml/qmldump/main.cpp

Task-number: QTCREATORBUG-1728
Reviewed-by: Kai Koehne

Task-number: QTCREATORBUG-1715

The relevance member is already used by the CompletionCollector. Instead
I introduced the 'order' member to store a value used for the sorting
of completion items.

Reviewed-by: Erik Verbruggen

Check for "breakpoint", "hw breakpoint" types.
Acked-by: hjk

This is handled by the generic pointer case nowadays and was (now) wrong
as it was impossible to see the 'bald pointer' version of it.

(cherry picked from commit bb0f033b)

(cherry picked from commit d2ea5a48)