Issue45

[katyhuff]

This PR handles issue #45.

• fixes alignment to be more readable
• condenses units into row definitions.
• elaborates on sources of information in the caption.
• the pwr table and the sfr table could be combined... how many batches per core did you assume for SFRs? Just one, probably... I've left some dashes where more information should be added.
• much of this information has come from duderstadt, so I added that book to the bibliography.
• the unit for burnup is usually not plural in tons (it's normalized by tons, so the unit is GWd per ton). So... it should be GWd/ton. More specifically, it usu GWd/MTIHM or GWd/tHM.
• There is no reason to state, in the row labels, that you're referring to PWR Cycle time or PWR Refuelling outage. The reactor type is listed in the column label.
• the number of assemblies per batch is not well described as '1/3 of the core'. I think the intention was probably to have a column "batches per core." If that's the case, the value should be 3.

[jbae11]

Thank you for taking your time to make these edits!