[LyX/2.3.x] Update scripts to support simultaneously python 2 and 3

commit f7b9d57a454fb3f6275ccfecbe842edd41e9ed49 Author: José Matos Date: Sat Apr 28 10:51:35 2018 +0100 Update scripts to support simultaneously python 2 and 3 The fixes are simple and on line with the changes made during the 2.3 development. It was an oversight to leave them o

[LyX/2.3.x] Update scripts to support simultaneously python 2 and 3

commit 1084e30f10fa4b4c78ef10a04adb5497a3341376 Author: José Matos Date: Sat Apr 28 10:51:35 2018 +0100 Update scripts to support simultaneously python 2 and 3 The fixes are simple and on line with the changes made during the 2.3 development. It was an oversight to leave them o