C++ Binding: changes for version 1.0f

The following changes were made between versions 1.0e and 1.0f of the ZOOM C++ binding:

1. Moved the recordSyntax enumeration inside the record class.
2. All option values are now strings: that is, option() methods now return char* instead of void*; and their value parameters, where appropriate, are of type char* instead of void*.
3. Removed the null implementation from query class's destructor.
4. Removed extraneous blank lines.
5. Added a destructor to resultSet class.
6. Replaced the resultSet class's getRecords() (plural) method with getRecord() (singular), which returns a const record*.
7. Removed ``No public constructor'' comment from record class.
8. Removed the null implementation from record class's destructor.
9. Added a clone() method (``virtual constructor'') to the record class.
10. Changed the record class's rawdata() method to return a non-const data pointer, and remove the no-longer-needed size_t *psize parameter.
11. Removed the following classes, which are now relegated to implementations:
    • MARCRecord
    • UKMARCRecord
    • USMARCRecord
    • XMLRecord
    • SUTRSRecord
    • GRS1Record
12. Add the data abstract class.
13. Fix capitalisation/punctuation for various comments.