qPCR design improvements

[lsilvam]

• add a cell to correct the number of tubes to split in, because it could happen that the number of replicates is odd
• add cells to account for efficiency curves (for each primer pair); maybe consider the variable: no. of dilutions and their actual concentration

[lsilvam]

• add plate layout 384-well

[lsilvam]

• update dataframe to have: date run and well