Parameterize functions with "q" as well as "l"

[mikeroswell]

Since many users will be familiar with the "q" parameterization used in vegan, iNEXT, etc., might be good to have an option (not default) to use "q" instead of "l". Will need good warning messages, implement across all main functions.

[mikeroswell]

q can now be used as an input, though outputs remain parameterized by l for the most part, with the exception of divpro, as of versioin 0.0.1.002