Clean up of code post SVN migration

Removed references to large data sets previously hosted
in the SVN CESM_postprocessing repo due to large file
restrictions on github.

Test suite: PI Control 113 (see examples)

Fixes [Github issue #]: starts to address #32

User interface changes: copy_html now creates a separate
index.YYYYMMDD-HHMMSS.html file each time it is run from
the postprocessing caseroot.

Input data changes: moved all data that was stored in the SVN
component subdir (atm_diag, ice_diag, lnd_diag, ocn_diag) into the
respective DIAGOBSROOT path locations on glade.

Code review:

.gitignore

@@ -1,14 +1,29 @@
-#########
-cesm-env2
-#########
-*.egg-info
-*.pyo
+# Ignore python bytecode files
 *.pyc
+*.egg-info
+
+# Ignore emacs backup files
 *~
-#########
-.svn*
-#########
+
+# Ignore python egg-info files
+*.egg-info/
+
+# Ignore python build and dist dirs
+averager/pyAverager/build/
+mpi_utils/pyTools/build/
+mpi_utils/pyTools/dist/
+
+# Ignore cesm-env2
+cesm-env2/
+
+# Ignore za binary, fortran object and mod files
 *.o
-za
 *.mod
 *.so
+
+# Ignore zonal average binary and link
+ocn_diag/tool_lib/za
+ocn_diag/tool_lib/zon_avg/za
+
+# ignore any .svn files
+.svn*