Copy number calculator rewrite draft V 0.1

Two commenters on SciencePrimer suggested changes to the copy number calculator for real-time PCR that I am implementing.

I've already added a molecular weight calculator to the site, but the original copy number calculator hasn't been rewritten to allow mass to be used as an input.  

Since this is a relatively old page on the site and one that gets a fair amount of traffic, I decided to completely rewrite the back end of the calculator as part of implementing the added functionality. Below is the first draft of the rewrite.

This draft contains the structure of the calculator but no functionality has been added.

v0.1 Status:

• Data entry area has been blocked out with two tabs. One for entering information needed to make calculation based on sequence length. The other for entering data needed to make calculation based a predetermined sequence mass
• The two dropdown areas (base mass options and about calculations) from the original calculator have been added. The areas open and close as intended, but the content has not been added to the about the calculation area.

Next steps:

• Place holder text in the data entry area needs to be replaced with entry form and output fields.
• Add about the calculation information to the about area.