Price Indices improvements

Suggestion by gladi: Add a information mouseover similar to planetsearch with more info on the index price.

For Consumables: Cost of 100 pioneers/day scaled to 100.0 for market maker sells

For Buildings: Cost of the average T1 building scaled to 100.0 for market maker sells

In the mouseover of the datapoints, replace ICA with CX ticker (IC1) to not be confused with the currency. Cut off the value after two decimal points for better readability.