Fixes Python programs to use new-style classes.

Although this isn't strictly a Python 3 requirement, using the
new-style class definition syntax improves consistency between Python
2 and Python 3.  Old-style classes have been deprecated since Python
2.2, but many such definitions linger on.  Python 3 eliminates
old-style classes, but instead of complaining about old-style
definitions, it simply unconditionally and silently makes all classes
new-style.  The only incompatible differences are quite subtle and
rarely matter in practice, but things are more consistent across
versions if the new-style definitions are used.

Also, the preferred method for subclasses to invoke parent init
methods is via the super() construct, which is only available with
new-style classes.  Using super() is especially useful with multiple
inheritance, which it handles automatically (provided that the init
methods have compatible signatures).

TESTED:
Using an SConstruct patched to run the build helpers with the target
Python, ran "scons build-all check ", as well as gpsprof and xgps,
with all six supported Python versions (except 2.6 for xgps).

5 files changed, 14 insertions, 13 deletions

diff --git a/gpsfake b/gpsfake
index 9a3f6f30..28e86c88 100755
--- a/gpsfake
+++ b/gpsfake
@@ -31,7 +31,7 @@ except NameError:
 # Make sure stdout can accept binary data in Python 3
 sys.stdout = gps.make_std_wrapper(sys.stdout)
 
-class Baton:
+class Baton(object):
     "Ship progress indications to stderr."
     # By setting this > 1 we reduce the frequency of the twirl
     # and speed up test runs.  Should be relatively prime to the
diff --git a/gpsprof b/gpsprof
index 5c9c52d6..d0aad600 100755
--- a/gpsprof
+++ b/gpsprof
@@ -21,7 +21,7 @@ import sys
 import time
 
 
-class Baton:
+class Baton(object):
     "Ship progress indication to stderr."
 
     def __init__(self, prompt, endmsg=None):
@@ -55,7 +55,7 @@ class Baton:
         return
 
 
-class plotter:
+class plotter(object):
     "Generic class for gathering and plotting sensor statistics."
 
     def __init__(self):
diff --git a/gpssim.py b/gpssim.py
index fb686e67..69c3da17 100644
--- a/gpssim.py
+++ b/gpssim.py
@@ -12,7 +12,7 @@ import gps, gpslib
 # and a satellite with specified orbital elements in the sky.
 
 
-class ksv:
+class ksv(object):
     "Kinematic state vector."
 
     def __init__(self, time=0, lat=0, lon=0, alt=0, course=0,
@@ -61,7 +61,7 @@ class ksv:
 # <http://www.wolffdata.se/gps/gpshtml/anomalies.html>
 
 
-class satellite:
+class satellite(object):
     "Orbital elements of one satellite. PRESENTLY A STUB"
 
     def __init__(self, prn):
@@ -88,7 +88,7 @@ class gpssimException(BaseException):
         return '"%s", %d:' % (self.filename, self.lineno)
 
 
-class gpssim:
+class gpssim(object):
     "Simulate a moving sensor, with skyview."
     active_PRNs = list(range(1, 24 + 1)) + [134, ]
 
@@ -186,7 +186,7 @@ class gpssim:
 MPS_TO_KNOTS = 1.9438445	# Meters per second to knots
 
 
-class NMEA:
+class NMEA(object):
     "NMEA output generator."
 
     def __init__(self):
diff --git a/maskaudit.py b/maskaudit.py
index 20bc5d0a..48058098 100755
--- a/maskaudit.py
+++ b/maskaudit.py
@@ -22,7 +22,8 @@ try:
 except ImportError:
     from commands import getstatusoutput
 
-class SourceExtractor:
+
+class SourceExtractor(object):
     def __init__(self, sourcefile, clientside):
         self.sourcefile = sourcefile
         self.clientside = clientside
diff --git a/xgps b/xgps
index 2646e5f7..4a0abbe6 100755
--- a/xgps
+++ b/xgps
@@ -40,7 +40,7 @@ import gps.clienthelpers
 SKY_VIEW_SORT_FIELDS = ('-used', 'PRN')
 
 
-class unit_adjustments:
+class unit_adjustments(object):
     "Encapsulate adjustments for unit systems."
 
     def __init__(self, units=None):
@@ -262,7 +262,7 @@ class SkyView(Gtk.DrawingArea):
         self.queue_draw()
 
 
-class NoiseView:
+class NoiseView(object):
     "Encapsulate view object for watching noise statistics."
     COLUMNS = 2
     ROWS = 4
@@ -308,7 +308,7 @@ class NoiseView:
                 widget.set_text("n/a")
 
 
-class MaidenheadView:
+class MaidenheadView(object):
     "Encapsulate view object for watching Maidenhead grid location."
 
     def __init__(self):
@@ -322,7 +322,7 @@ class MaidenheadView:
             return self.widget.set_text("n/a")
 
 
-class AISView:
+class AISView(object):
     "Encapsulate store and view objects for watching AIS data."
     AIS_ENTRIES = 10
     DWELLTIME = 360
@@ -436,7 +436,7 @@ class AISView:
                     (ais.type, ais.name, "(%s navaid)" % ais.epfd_text, "", where, ais.aid_type_text))
 
 
-class Base:
+class Base(object):
     COLUMNS = 3
     ROWS = 7
     gpsfields = (