added Joao updates to currentTSD

new plotManySamples
new subtractBackgroundValue
new moveInTime
functions
Updated plotManySamples, moveInTime, use of medians in plotSpecificGrowthW1vW2, blank correction, added Lag and phase calculations, and gfp/od plotting
Cleaned up code
Merge pull request #1 from htlm/master

TSD with Phase Times etc and moveInTime etc