(hopefully) made run_all_tests.sh more portable

	- I hope this works for everybody else, but I think it should

Author: jeff-dh

solid/test/run_all_tests.sh

@@ -4,15 +4,16 @@
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null && pwd )"
 cd $DIR
 
+export PYTHONPATH="../../":$PYTHONPATH
 # Run all tests. Note that unittest's built-in discovery doesn't run the dynamic 
 # testcase generation they contain
 for i in test_*.py;
 do 
     echo $i;
-    python $i;
+    python3 $i;
     echo
 done
 
 
 # revert to original dir
-cd -
+cd -