vchoi_fork

[svn-r16347] Purpose: enhancements the H5Tinsert, H5Tpack

Description: H5Tinsert will now detect when a compound type that was previously
not packed becomes packed due to out of offset order insertion of a member.
H5Tinsert will now attempt to keep members sorted by offset order.  This should
improve performance of H5Tinsert in all cases due to the fact that it no longer
needs to check every other member for overlapping, and should improve
performance of H5Tpack and possibly type conversion when compounds are packed
out of order.

Tested: jam, smirom (h5committest)