note 102586 added to ibm-db2.configuration

The explanation of ibm_db2.i5_dbcs_alloc seems to be hard to understand for me.

In ibm_db2 extension inside, 6 times length of string column is allocated if i5_dbcs_alloc value is 1.
The allocated area is used for conversion between UTF-8 and EBCDIC character encodings.

By the definition of UTF-8, letter length can need 6 bytes at the maximum.

Note:
In the case of a long column, allocated size may be beyond the upper limit defined in DB2 because original column is made by 6 times.  It can cause result data becomes null.
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