FRAM: cFram::Cursor::saveField() doesn't return error status or log problems

[terrillmoore]

This is for the future FRAM scrub. saveField() needs to change to bool and do more logging, e.g.,

	bool rc;

	rc = true;
        if (! cursor.create())
                {
                gLog.printf(gLog.kError,
                        "%s: can't save uKey(0x%x) %u bytes\n",
                        __func__, uKey, nValue
                        );
		rc = false;
                }

        if (! cursor.put(pValue, nValue))
		{
		gLog.printf(gLog.kError, "%s: can't put uKey(0xx) %u bytes\n",
			__func__, uKey, nValue
			);
		rc = false;
		}

	return rc;