Do not apply Label properties to Title

Side effect: Improves compatibility with MATLAB R2014b, which no longer
allows to call cell2mat upon graphics handles (handles are now objects
instead of numbers).
Fix legend handle recovery on MATLAB R2014b

Change handle acquisition to account for the reorganization of figure
properties that R2014b introduces.
- Recover legend handles using object types on MATLAB R2014b.
- Only filter legend and colorbar handles by tag on older MATLAB
versions.
- Use findobj instead of findall to ignore hidden handles.
Refactor figure handle recovery

Make the distinction between older and newer MATLAB versions clearer.