Implemented dummy *_clear functions as a porting aid.
Implemented dummy *_clear functions as a porting aid.

jtobey/javascript-bignum,jtobey/javascript-bignum,angeni8/javascript-bignum,angeni8/javascript-bignum,jtobey/javascript-bignum,jtobey/javascript-bignum,angeni8/javascript-bignum,jtobey/javascript-bignum,angeni8/javascript-bignum,angeni8/javascript-bignum,angeni8/javascript-bignum,jtobey/javascript-bignum