Move PyLNP.json, stderr, stdout to the LNP/ folder

[Pidgeot]

The top-level folder in the pack should be as clear and simple as possible, and adding technical-looking files is intimidating to many players. The LNP/ folder is a logical place to put these configuration files to maintain a clean user-facing folder.

[Issue created by PeridexisErrant: 2014-08-25]
[Last updated on bitbucket: 2014-09-07]

[Comment created by Pidgeot: 2014-09-07]
Allow PyLNP.json to be stored in LNP folder (fixes #14)

→ <<cset 8db40566cc73>>

[Comment created by Pidgeot: 2014-09-07]
In the next push, the program will use LNP/PyLNP.json if it exists. If it doesn't, it will look for PyLNP.json instead.

PyLNP.user, stdout.txt and stderr.txt will stay in the main folder.

[Comment created by Pidgeot: 2014-08-25]
PyLNP.json, sure, but stderr and stdout are needed in case of an error - if the program crashes, those files should make it easier to determine the problem. I'm not convinced that "hiding" those is a good idea.