Make sure bin/python line is before encoding line in scripts

[Ed McDonagh]

Bin/python line should be on the first line and the utf8 coding statement on the second line.

As raised by @tcdewit in issue #567

[Ed McDonagh]

Changed the scripts so that the interpreter line is first, and the encoding information is on the second line. Refs #567 and #581

→ <<cset 8f08a2ed1c8f>>

[Ed McDonagh]

Adding ref #581 to changes

→ <<cset a06e5e971184>>

[Ed McDonagh]

Merged in issue567scriptsnotworking (pull request #148)

Fixes #567 (again) and fixes #581

→ <<cset bd8559b8b5a9>>