Only hide part of the comparison toolset

Switching out scenarios to compare is the only part that should be
hidden - that becomes enabled once a scenario is stored.
Otherwise should always be valid to switch out the comparison type,
being “selected cells” vs “entire landscape”.
Patch up comparison popup

Had some mismatched Ext.id’s which where not unique, which is bad.
Also added proper hooks in Report_Detail to control switching the
comparison options.
TODO: need to actually make the hooks in Report_Detail function
properly, could be tricky though