Improvements and fixes

A plant's component counts and total inverter power are complete again. The analysis tables now let their columns be chosen, and the components page marks components that have gone a year without data.

• On the analysis page, "Select Columns" chooses which columns the inverter, combiner box and string tables show.
• The components page now marks any inverter, combiner box or string that has sent no data for 1 year.
• A plant's component counts and inverter power are complete again, after components that were never hidden had been left out.
• The "Report" entry in a plant's menu is greyed out and cannot be opened.