RE 6901 MantidEV usability

Changed |Q| range to go up to 35.
Set MinRecursionDepth to 7 on ConvertToMD, to give
at least 128x128x128 boxes.  This makes the slice
viewer a bit more usable.

Refs #6901
RE 6901 MantidEV usability

Added units (A^-1) to appropriate labels on the
Integrate tab.

refs #6901
RE 6901 MantidEV usability improvements

Added menu option to reset default state of all GUI components.
Removed some debug prints.

refs #6901
RE 6901 MantidEV usability

Added controls on the first form to allow the user to restrict the
range of Q values, and choose whether or not to do the Lorentz
correction when converting to MD.  This will be necessary for
large molecule/protein crystallography.

refs #6901
RE 6901 MantidEV usability

Added help menu item and linked it to initial, incomplete
help page for MantidEV.  The help page will be completed
before the release.

refs #6901
RE 6901 MantidEV usability

When the user selects an event file to load,
default names are now provided for the event, md
and peaks workspaces.

refs #6901
RE 6901 MantidEV usability

Added option to append peaks to an existing peaks file,
as requested by Xiaoping.

refs #6901
RE 6901 MantidEV usability

Minor change to .ui file, to fix layout on some
systems after adding (A^-1) to appropriate labels
on the Integrate tab.

refs #6901
Merge remote branch 'origin/feature/6901_MantidEV_usability'