Enhancement #2:  OSH Update

Update the Orders Status History -- Updated plugin's files to v1.1.0.
Issue #1:  Change sidebox default

Updated the installation processing to set the default value for the
"Include in Information Sidebox" setting to false.
Issue #1, Enhancement #2:  readme updates

Update the readme to show v2.6.1, correct PHP code example in the
"Information Sidebox" section.