runscript: don't print errors when everything is OK
axis: Show any Python error resulting from trying to parse the file

Closes #319, in which apparently an IOError 'No such file or directory'
caused the whole program to exit.
runscript: fix typo in earlier commit
axis: python2.5 compatiblity
blend: Make the docs match the component behavior

The doc describes an obvious in1/in2/select relationship, but it is
reversed as compared to the code. Change the docs to match the
counterintuitive code to avoid breaking any existing HAL configurations.
Merge branch 'v2.5_branch'