Release v2.0

- Overhaul installation organisation
  - Put all files inside a "virtualatex" folder, don't spread them
    around
  - Avoid visible references to TinyTex, that's another project
- Fixup corner cases on "-O"

Release v1.0

- Support avoiding overwriting existing installations.
- Improve documentation and installation files.

This little script is now fully featured, v1.0 is achieved.

Cache big remote downloads locally

With this feature, this is basically ready for prime time.

v1.0 should be released soon.