Remove KICAD_PTEMPLATE environment variable as it's purpose was not
clear and was often poorly defined as the path to the KiCad installed
templates.
Add a new KICAD_TEMPLATE_DIR environment variable which clearly should
be the path of the KiCad installed templates. Make this environment
variable available in the user settings in case the default is wrong
which has been the case in some instances. Use the standard search
stack to set the default system template path which has a much greater
chance of being correct.
Add a new KICAD_USER_TEMPLATE_DIR environment variable which clearly
should be the path of the user defined templates. Users most likely
were not even aware of the old default user path unless they read the
fine manual.
Set template path search stack priority as follows:
* KICAD_USER_TEMPLATE_DIR
* KICAD_TEMPLATE_DIR
* Search stack template paths
Reverse template selection dialog and project path dialog for improved
user experience.
Fixes lp:1543443
https://bugs.launchpad.net/kicad/+bug/1543443
5678a166ee
