plotNatMort: Function to plot natural mortality rates by year
In wStockhausen/rTCSAM2013: Functions to run and plot output from TCSAM2013 models.

This function plots natural mortality estimates by year and sex for immatures, new shell matures and old shell matures.

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plotNatMort(sdobj, styr = 1949, endyr = 2013, min.yr = 1970,
  max.yr = endyr, clrs = c("green", "blue", "black"), pchs = c(21, 21,
  21), ltys = c(1, 1, 1))

`sdobj`	- object (dataframe) obtained from reading the TCSAM2013 .std file
`styr`	- model start year
`endyr`	- model end year
`min.yr`	- min year to plot
`max.yr`	- max year to plot
`clrs`	- colors to use
`pchs`	- point types to use
`ltys`	- line types to use