Added tool tips to MantidEV controls.

refs #7370

Help menu on ImageViewer now has link to on line help page
on the Mantid project web site.

refs #6132

There is also a unit test to check for this condition.

user request:

only populate the Filename box with a workspace name if a single detector
has been reduced (front/rear/main/hab) **or** if it is the MERGED
workspace. In the case of BOTH, leave it empty and force the User to
select a Save algorithm.

re #6929

the commit a542e0b5 changed the units,
and this commit, updates the unit test.

re #6929
re #6839

The example used to old API and therefore did not work out of the box.

Re #7001. Conflicts:
	Code/Mantid/Framework/Algorithms/src/GeneratePeaks.cpp
	Code/Mantid/Framework/Algorithms/test/FindPeaksTest.h

saves the unfitted data and not the fitted one.

re #6929

add the properties transmission and transmissioncan to the merged workspace
this allows the savecansas to save those values.

re #6929

Correct a wrong implementation of saving cansas that does not take the
correct number of values to save them.

re #6929
re #6839