Revert "Octave: drop support for Octave versions older than 3.2.0"

This reverts commit 952eee8f59.

Reverting a series of Octave commits for re-applying again without
incorrect whitespace changes.

Examples/octave/module_load/runme.m

@@ -61,6 +61,12 @@ testme
 testme
 clear all
 
+# octave 3.0.5 randomly crashes on the remaining tests, so skip them
+api_version = sscanf(octave_config_info("api_version"), "api-v%i");
+if api_version < 37
+  exit
+endif
+
 # load module with no cvar
 clear all;
 swigexample2;