visumot_summary: visumot_summary
In grrchrr/VisumotR: Visualizing Motility on Images

To be written...

1	visumot_summary(df, ...)

`df`	dataframe of the form: `df(track, time, X, Y, mapping_parameters, ...)`
`frame`	`integer`: frame to be mapped
`time.unit`	`character`: time unit
`tracks`	`vector`: defining tracks to be displayed
`par.map`	`character`: specifying parameter in `df` to be visualized by color
`par.shape`	`character`: specifying parameter in `df` to be mapped on shape
`ribbon`	`logical`: display ribbon
`ribbon.stat`	`character`: choose ribbon-statistic: `'sd'`: standard deviation, `'se'`: standard error, `'ci'`: confidence interval
`line.size`	`numeric`: size of lines
`line.alpha`	`numeric`: transparency of lines
`line.length`	`numeric`: length of lines (in frames)
`points.size`	`numeric`: size of points
`points.alpha`	`numeric`: transparency of points
`points.shape`	`numeric`: set shape from ggplot2 shape palette
`unit`	`character`: setting name of unit; default: `'px'`