Update python3 and web links

Author: Kay Kasemir (ky9)

README.md

@@ -11,7 +11,7 @@ For latest snapshot of documentation, see https://controlssoftware.sns.ornl.gov/
 To build local copy of documentation from sources, you need to install sphinx, http://sphinx-doc.org/.
 To install on Linux (RedHat):
 
-    sudo yum install python-sphinx
+    sudo yum install python3-sphinx
 
 To build documentation from sources:
 

doc/make_version.py

@@ -1,5 +1,5 @@
 
-print """
+print("""
 Version Info
 ============
 
@@ -9,13 +9,13 @@
    from scan.version import __version__, version_history
    print __version__
    print version_history
-"""
+""")
 
 import sys
 sys.path.append("..")
 from scan.version import __version__, version_history
 
-print "Version history::"
+print("Version history::")
 
 for line in version_history.splitlines():
     print ("   " + line)

doc/overview.rst

@@ -6,15 +6,19 @@ You can assemble new scans, submit them, monitor their progress.
 
 For a general overview of the scan system see
 "CSS Scan System", Proceedings of ICALEPCS2013, San Francisco, CA, USA
-( http://accelconf.web.cern.ch/AccelConf/ICALEPCS2013/papers/frcoaab01.pdf or http://epaper.kek.jp/ICALEPCS2013/papers/frcoaab01.pdf )
+( https://accelconf.web.cern.ch/ICALEPCS2013/papers/frcoaab01.pdf
+or http://epaper.kek.jp/ICALEPCS2013/papers/frcoaab01.pdf )
+
 
 Use Case: CS-Studio Displays
 ----------------------------
 
 For routine execution of the same scan where just a few parameters change,
-create a CS-Studio display that allows configuring them.
+you can create a CS-Studio display for those parameters.
+On the display, local or real PVs then allow users to for example configure
+the start, end, and step size of a motor move.
 A "Submit" button then invokes a jython script which assembles
-a scan.
+a scan that moves a motor based on the values in those parameter PVs.
 
 
 Use Case: Table-Based Scans