ee_plot: Plot EarthExplorer scene list
In azvoleff/teamlucc: TEAM land use and cover change data processing toolkit

This function can produce two different types of plots from a USGS EarthExplorer Landsat CDR Surface Reflectance scene list.

1 2	ee_plot(x, start_date, end_date, min_clear = 0.7, exclude = list(), normalize = FALSE, title = NULL)

`x`	a `data.frame` with a list of Landsat scenes as output by `ee_read`
`start_date`	starting date as a `Date` object
`end_date`	end date as a `Date` object
`min_clear`	the minimum percent clear to plot (calculated as 1 - percent cloud cover). Images with less than `min_clear` fraction of the image area free of clouds will be ignored.
`exclude`	a list of sensors to exclude (for example, set `exclude=c('LE7', 'LT4')` to exclude Landsat 7 ETM+ and Landsat 4 TM images.
`normalize`	if `TRUE`, plot as a normalized line plot
`title`	title for plot (or `NULL` for no title)