Log Message:
Add p5-Tie-CPHash version 2.000.

This implements a case preserving but case insensitive hash table.
This means that

    $cphash{KEY}    $cphash{key}
    $cphash{Key}    $cphash{keY}

all refer to the same entry.  Also, the hash remembers which form of
the key was last used to store the entry.  The `keys' and `each'
functions will return the key that was used to set the value.