Handle changes in eint1 (possibly-complex result from real input), and remove reliance on li() function.
New index message for rec (via findrecd).
Improvements to isperiodic: return 0 if no periodicity is found, and print lower bound on period.
Support for Collatz() function, even though the name is not finalized.
Remove alising of deprecated function names.
Update issemiprime to use forprime_t.