MINOR: tools: make parse_size_err() support 32/64 bits

MINOR: tools: make parse_size_err() support 32/64 bits

parse_size_err() currently is a function working only on an uint. It's
not convenient for certain elements such as rings on large machines.

This commit addresses this by having one function for uints and one
for ullong, and making parse_size_err() a macro that automatically
calls one or the other. It also has the benefit of automatically
supporting compatible types (long, size_t etc).