Some code improvements thanks to Thibault North remarks

Change-Id: I1b9fad99a949b730ba58ef37535e9455c9b09570
Signed-off-by: Aurélien PIERRE <aurelien@aurelienpierre.com>
Replace subprocess.call by os.popen which seems to use less CPU thus
less battery power on laptops

Merge remote-tracking branch 'origin/master'

Conflicts:
	texmaker-note.py

Change-Id: I1c302e52dee5424bf36b699061f1dc0e46223c85
Signed-off-by: Aurélien PIERRE <aurelien@aurelienpierre.com>