fix test for perls compiled with long double
tidy
test for find_closest_numbers_around
convert numberic values to long double

so we wouldn't loose precision on perls with 64bit integers or long double
numeric values. Fixes #1. Although I still need to think what to do with
those cases there long double is not big enough to fit 64 bit int.
add test with unsigned 64 bit integers
bump version 0.07_01
coerse strings into numbers
bump version 0.07_02