remove broken debug in get_new()

BEFORE:

```
B:\code\apt>apt new
Package             Installed   Available
-----------------   ---------   ----------
Traceback (most recent call last):
  File "apt.py", line 1646, in <module>
    __main__.__dict__[command] (packages)
  File "apt.py", line 423, in new
    for p in sorted(get_new()):
  File "apt.py", line 925, in get_new
    debug (" %s > %s" % (new, ins))
TypeError: 'bool' object is not callable
```

AFTER:

```
B:\code\apt>apt new
Package             Installed   Available
-----------------   ---------   ----------
gdal                1.11.1-4    (1.11.1-5)
gdal-filegdb        1.11.1-4    (1.11.1-5)
...snip...
qgis-dev            2.7.0-21    (2.7.0-48)
qgis-grass-plugin   2.4.0-1     (2.6.1-1)
```

Briefly tested using new --debug flag instead, but decided the output
wasn't that useful anyway.