vchoi_fork

[svn-r11573] Purpose:
Bug fix

Description:
Changed configure.in to use an environment variable TR to set the path
to the tr utility.

Solution:
There are two kind of tr on Solaris with slightly different syntax.
HDF5's configure relies on the "standard" tr.  Traditionally, HDF5ers
have needed to make sure that the "right" tr was found before the
wrong one in their path; now they can use an environment variable.

Platforms tested:
mir, shanti, sol

Misc. update:
Forgot to update release notes.  Off to do that now.