* state.R (encode_ms2_to_line, pack_ms2_w_summ): Functions to pack ms2
data based on selected entries in `summ'.

* app (ms2_spectra_tab_name, ms2_spectra_tab_b): New widgets.

* shiny-ui-base: Added input$ms2_spectra_tab_b observer.

Everything under Measurement Properties refreshes correctly now. The
reason why it did not was the overuse of req functions.

Now, bring back other functionality.

This time, sel_spec updates, but switching between compounds does not
always clean it up.

functions which select and define colour palette based on data.

ms1_rt is not calculated well over groups in `summ_rows'.