- further fixes of inccorect overflow errors for int (and long on LLP64 systems) * prev commit had bugs * added overflow tests for also int, long, long long (for both, lp64 and llp64) - while at it, fixing a reference leak when not using python with utf8 caching

# Package: rdyncall 
# File: demo/sqrt.R
# Description: C math library demo (dynbind demo) 

dynbind( c("msvcrt","m","m.so.6"), "sqrt(d)d;" )
print(sqrt)
sqrt(144)