Add infinite series for p, p^2 and (for classical) p^3

[olexandr-konovalov]

For a prime p, this classification is known for a general case, so there is no need to keep the database for each individual p. There should be a way to generate a complete list "on fly" for a given prime p.

[vendramin]

Size p and p^2 are done (these are always classical braces).