automatically try to detect type of columns from the first 10 rows of file:
If column only contains integer, only show, int, float, monetary, m2o, o2m, m2m fields in wizard
If column only contains true/false values, only show boolean fields in wizard
etc
add an advanced mode which is the same as previous import (show all fields)
Support different date format and float value with currency as well as float value with parenthesis to reprensent negative value.