started tabwrapper and waveshapechebshev, fixes

started new objects, fix expline~s to use tabread4~, iterate has an
inlet for setting number to iterate to,
added sampdel~ and tcheb~, fixes, changed names

changed names of waveshapex~, waveshapetch~, changed behavior of
oscope~ and repeater~, I'd forgotten to change the tabread~ to
tabread4~ in expline~