Clarify a few documentation items.
LatentHeat: rm “Reset Experiment” button & disable ‘Start adding heat'

Remove one of the Reset buttons from the Latent Heat interactives.

Disable 'Start adding heat' button in Latent Heat interactive after the first time it is clicked.

[#61563022][#61563190]

https://www.pivotaltracker.com/story/show/61563022
https://www.pivotaltracker.com/story/show/61563190
Remove time display from playback controller in Latent Heat interactives

[#61563608]
https://www.pivotaltracker.com/story/show/61563608
ITSI: Fix Concentration and Breathing
ITSI: Fix Making and Breaking Bonds (A+A->A2)
ITSI: Fix Making and Breaking Bonds (A+B->AB)
ITSI: Fix Dissociation Energy interactive
ITSI: Fix Dissociation (rites copy) interactive
ITSI: Fix Activation Energy 1 interactive
ITSI: Activation Energy 2 interactive

[#61170460]
ITSI: Activation Energy 3 interactive

[#61170538]
ITSI: Fix model ids
ITSI: Activation Energy 4 interactive

[#61170594]
Mustache 0.8 breaks things...
more obvious absorption differences among mixtures

[#60262004]
stop slider handle keydown event from bubbling

[#47309921 #60262004]

This fixes an issue where controlling the slider handle
with the keyboard would cause the model to step backwards
and forwards in time.
Fix bug in md2d removeLine()
ITSI: Heat and Temperature 4 interactive
better energy level distribution among mixtures

[#60262004]
ITSI: Heat and Temperature 2 interactive

[#61767464]