Add the transmission information to the reduced workspace

Due to some limitations imposed by the way the Singleton is used, there is
no way to get the transmission workspaces after the reduction is finished
from the user interface, except using the attempt to guess the name of the
transmission workspaces (what we should not do). So, I propose here keeping
the information about the workspaces of the transmission at the SampleLog
of the Reduced workspace. This information will be them available whenever
is necessary. It would even allow us to use this information inside the SaveCan
algorithm itself. But, I think it would seem a litle bit of magic. So, i
prefer to use it outside.

re #6929
Extend SANSBatchMode to use the transmission workspace for CanSAS

It will pass on the parameters to SaveCanSAS1D if they are available.

re #6929
Extend SingleMode to use the transmission workspace for CanSAS

It will pass on the parameters to SaveCanSAS1D if they are available.
Changes on SANSRunWindow.cpp

re #6929
correct the number of bins at transmission

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

re #6929
re #6839
Implement the saving transmission and transmissioncan to merged option

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

re #6929
Correct the Transmission and TransmissionCan to take the unfitted data

saves the unfitted data and not the fitted one.

re #6929
Correct the unit test to adjust the units

the commit a542e0b51658f4f324fbf0ac649aed3380469fd7 changed the units,
and this commit, updates the unit test.

re #6929
re #6839
Disable saving output on both & single mode

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
Re #6929 Remove warning as agreed
Merge remote branch 'origin/feature/6929_use_sancas_v1_1'