help_insert: help insert
In XiaoliangJiang/IndependentStudy2017YW: Structure and abstract your code

A helper function to insert text

1 2	help_insert(x, start_row = 1, start_indention = Inf, start_indention_margin = 0, end_row = 2, end_indention = Inf)

`x`	An object to insert
`start_row`	the start row of the insertion
`start_indention`	The start position within the row
`start_indention_margin`	A margin (i.e. spaces) that will be added at the target row before `x` is inserted.
`end_row`	the row where the cursor should be after the insertion
`end_indention`	The end position within the row