Bugfix about `WHEN` condition of `SEARCH`

[tsh-hashimoto]

There is a problem with this product: If there is an OCCURS key item on the right hand of the WHEN conditional expression, a conversion error occurs.
This problem can be avoided by specifying a configuration file with the -conf option when executing cobj.

This pull request includes the addition of a new COBOL compiler configuration file and updates to the test suite to verify the new configuration settings. The most important changes are:

Configuration updates:

• config/allow-key-in-rhs.conf: set yes to allow-search-key-in-rhs.
  • -> moved to tests/command-line-options.src/

Testing updates:

• tests/command-line-options.src/conf.at: update to include new test cases for the allow-search-key-in-rhs configuration. These test cases check the behavior of COBOL programs with different configurations and ensure they compile correctly.

[yutaro-sakamoto]

@tsh-hashimoto Please move config/allow-key-in-rhs.conf to other directory (e.g. tests/command-line-options.src/). Since compiler users refer to the config/ directory, any changes to the contents of the directory should be carefully considered.

[tsh-hashimoto]

@yutaro-sakamoto Thank you for checking. I moved allow-key-in-rhs.conf to tests/command-line-options.src/ (and a little fixed the test conf.at).