vt_analysis: vt_analysis function
In austinjcase/BreedR: An R package for managing a breeding program

This function allows 1 2 and 3 yr data reprots like PR24

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vt_analysis(exp_data = NULL, fld_data = NUL, qual_data = NULL,
  trial_type = NULL, yr1 = NULL, yr2 = NULL, yr3 = NULL,
  trait_sel = NULL, exclude = NULL, expt_obj = NULL, cut_offs = NULL)

`exp_data`	REQUIRED `data.frame` experiemtn description file from OAT DATA BASE
`fld_data`	REQUIRED `data.frame` field phenotype file from OAT DATA BASE
`qual_data`	REQUIRED `data.frame` quality phenotype file from OAT DATA BASE
`yr1`	REQUIRED `vector` first year of data to use example (2017) at least one value is required for yr1 or yr2
`yr2`	OPTIONAL `vector` first year of data to use example (2016) at least one value is required for yr1 or yr2
`yr3`	OPTIONAL `vector` first year of data to use example (2015)
`trait_sel`	REQUIRED `vector` exact name of trait to use in anlysis example "yield"
`exclude`	OPTIONAL `list` list of trial_names to exclude from the OAT DATA BASE example (c("vt_2017_stp", "vt_2016_stp"))
`expt_obj`	REQUIRED `list` list of experimnetal objectives as defined from the OAT DATA BASE example (""agro"")
`cut_offs`	OPTIONAL `list` list of critical values to drop of from trait data, where the first is the low and the second is the high example (c(50, 300) )
`tyial_type`	REQUIRED `vector` type of trial as described by the OAT DATA BASE example "vt"