Aubit 4GL SVN-Code

In function LEXLIB_rettype(): Changed type conversion code to more readable
form and added detection and logging of unsupported types.
In function LEXLIB_print_foreach_close: Added logic to change status after
a succesful foreach loop from 100 to 0.

Somewhat cleaned up and fixed logic, misguiding function name A4GL_get_errm
changed to A4GL_get_errmsg, buffer size increased

Function name logging added - functions A4GL_debug_full_extended(),
A4GL_set_line_extended(). Buffer size increased.

Logging some messages to stdout changed to stderr.

Added setting error string in assertion handling code.

In function find_columns():
Changing calls to strcmp() to A4GL_aubit_strcasecmp(), added support for
owner prefixed columns, removed (commented) calls to A4GLSQL_set_status(),
that seems to be unneeded (not sure about that).

STRIP_QUOTES_FROM_OWNER convertsql parameter added.
USE_DESCRIBE_NOT_SQLCOLUMNS parameter setting changed from environment
variable to a convertsql parameter.
Added support for disabling the query cache.
Copy-pasted logic doing quoting/unquoting owners moved to one function,
A4GLSQLCV_ownerize_tablename().

ERR_CHK_ERROR macro fixed

Removed unused code

Just some comments