Have .gpirc preferences stay with conda environment

[borupdaniel]

As a developer it's frustrating to have to modify/backup/restore the .gpirc file when switching between different conda environments. As a GPI user less familiar with command line tools, finding and editing .gpirc in the default location isn't trivial.

I propose a modification where:

• .gpirc is moved inside the conda environment, probably inside the gpi site-packages folder.
• GPI looks there first, then to the user's home directory
• A "modify GPIRC" option is added to the GPI menus to allow users to change these preferences without having to see the preferences file itself. This could just spawn a text editor with .gpirc open, or if we want to get a little fancier, could be a window for modifying the various options in a GUI format.